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Recent questions tagged physics
Questions
A plane mirror is made of glass slab $(\mu g=1.5)\;2.5\;cm$ thick and silvered on back. A point objected is placed 5 cm in front of unsilvered face of mirror. What will be the position of final image.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
difficult
asked
Feb 19, 2014
by
meena.p
1
answer
At the distance of 5 cm and 10 cm from surface of a uniformly charged solid sphere , the potentials are 100 V and 75 V respectively . Then which of the following statements are correct $\; $ 1. Potential at it's surface is 150 V $\;$2.The charge on the sphere is $\;\large\frac{50}{3}\;\times 10^{-10}\;C$ $\;$3.Electric field on the surface is $\;1500 V/m\;$ $\;$4.Electric potential it's centre is 25V $\;\quad \;$
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 19, 2014
by
yamini.v
1
answer
Magnetic moment of an electron in the $n^{th}$ orbit of the hydrogen atom is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-force
difficult
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
The refractive index of a prism is 2. This prism can have a maximum refracting angle of
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
easy
asked
Feb 19, 2014
by
meena.p
1
answer
Two concentric shells have radii R & 2R , charges $\;q_{A}\;and\;q_{B}\;$ and potential 2V and $\;\large\frac{3}{2} V\;$ respectively . Now shell B is earthed and let charges on them becomes $\;q_{A}^{|}\;and\;q_{B}^{|}\;.$ Then $\;\large\frac{q_{A}^{|}}{q_{A}}+\large\frac{q_{B}^{|}}{q_{B}}\;$ is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 19, 2014
by
yamini.v
1
answer
A glass sphere with radius 10 cm has concentric spherical equity of radius 5 cm. A narrow beam of parallel light is directed into sphere, as shown . Find the position of final image from centre of sphere
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Feb 19, 2014
by
meena.p
1
answer
A large metal sheet carries an electric current along its surface with $ \lambda$ being the current per unit length. The value of the magnetic field near the surface of the sheet is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-due-to-moving-charges
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
The electric potential at a point $\;(x , y)\;$ in the x- y plane is given by $\;V=-k\;x\;y\;$. The field intensity at a distance r in this plane , from the origin is proportional to
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
difficult
asked
Feb 19, 2014
by
yamini.v
1
answer
There exists uniform electric and magnetic fields in space. A particle is moving with a velocity $ \overrightarrow v$ and suddenly a hollow metallic cube is enclosed around it. The change in force exerted on the particle is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magentic-field
motion-in-combined-electric-and-magentic-fields
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
Two parallel wires carrying equal currents in the opposite directions are placed at $x = \pm$ a parallel to the $y$-axis with $z = 0$. Magnetic field at origin $O$ is $B1$ and at $P (2a,0,0)$ is $B2$. Then the ratio $ \large\frac{B1}{B2}$ is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
force-between-two-parallel-currents
torque-on-current-loop-and-magnetic-dipole
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A wire of length $1m$ is placed in $x-z$ plane carries a current of $1A$. The coefficient of friction between the wire and the surface is $0.2$ and the mass of the wire is $2\; Kg$. The magnetic field of strength $2T$ exists along positive $y$ direction. Then which of the following is correct
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-force
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A charged particle enters a magnetic field at right angles to the magnetic field. The field exists for a length equal to 1.5 times the radius of the circular path of the particle. The particle will deviate from its path by
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magentic-field
easy
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
Ratio of the magnetic field at the centre of a current carrying coil of radius $R$ and at a distance of $3R$ on its axis is
jeemain
aipmt
physics
cbse
class12
ch4
-and-magnetism
magnetic-field-on-axis-of-current-circular-loop
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A uniform magnetic field $ \overrightarrow B = B_0\hat j$ exists in space. A particle of mass $m$ and charge $q$ is projected towards negative $x$-axis with speed $v$ from a point $(d,0,0)$. The maximum value of $v$ for which the particle does not hit the $y-z$ plane is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
An observer can see through a pin hole the top end of a thin rod of height h, placed as shown. The beaker height is 3 h and its radius is h. When the beaker is filled with a liquid up to a height 2h ,he can see the lower end of the rod. Then RI of liquid is .
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
difficult
mock
aims-12-physics
asked
Feb 19, 2014
by
meena.p
1
answer
An electron is moving along positive $ x$-axis. A uniform electric field exists along negative $y$-axis. What should be the direction of the magnetic field (constant) so that the force on the electron is zero?
jeemain
aipmt
physics
cbse
class12
ch4
ch5
magnetic-effects-of-current-and-magnetism
q12
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A copper wire of diameter $1.6mm$ carries a current i. The maximum magnetic field due to this wire is $5 \times 10^{-3} T$. The value of $i$ is
jeemain
aipmt
physics
cbse
class12
ch4
ch5
magnetic-effects-of-current-and-magnetism
q11
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
Figure shows a closed dotted surface which intersects a conducting uncharged sphere . If a +ve charge is placed at the point P, the flux of the electric field through the closed surface
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
difficult
asked
Feb 19, 2014
by
yamini.v
1
answer
A proton beam is going from north to south and an electron beam is going from south to north. Neglecting the earth’s magnetic field, the electron beam will be deflected (consider only magnetic forces)
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
force-between-two-parallel-currents
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
Two beam of light having intensities $I$ and $4I$ interfere to produce a fringe pattern on a screen . The phase difference between beams is $ \large\frac{\pi}{2}$ at point A and n at point B. Then the difference between resultant intensities at A and B is
jeemain
physics
class12
unit16
wave-optics
addition-of-waves
medium
asked
Feb 19, 2014
by
meena.p
1
answer
There are two uncharged identical metallic spheres 1 and 2 of radius r separated by a distance d (d > > r) . $\;\lambda\;$ charged metallic sphere of same radius having charge q is touched with one of the sphere . After some time it is moved away from the system . Now the uncharged sphere is earthed . Charge on earthed sphere is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electric-charge
electrostatic-potential
difficult
asked
Feb 19, 2014
by
yamini.v
1
answer
A non-conducting disc of radius a and uniform +ve surface charge density $\; \sigma\;$ is placed on the ground with it 's axis vertical . A particle of mass m and +ve charge q is dropped , along the axis of the disc from a height H with zero initial velocity . Find the value of H if the particle just reaches the disk .$\;\large\frac{q}{m}=4 \in_{0} g/\sigma$ . Find the position of particle at which the particle is in equilibrium. Find the energy of the particle at $\;H=\large\frac{a}{\sqrt{3}}\;$ assuming the gravitational energy at $\;H=0\;$ to be zero
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
difficult
asked
Feb 19, 2014
by
yamini.v
1
answer
In a YDSE , 12 fringes are observed to be formed in a certain segment of screen when light of wavelength $600\; nm$ is used. If the wavelength of length is changed to $400\; nm$ , number of fringes observed in same segment of screen in given by
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
easy
asked
Feb 19, 2014
by
meena.p
1
answer
A ray of light falls on a transparent glass slab with refractive index (relative to air) of $1.62$ . The angle of incident for which the reflected and refractive rays are mutually perpendicular is :
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
easy
asked
Feb 19, 2014
by
meena.p
1
answer
When a beam of light with wave length $\lambda= 6000 A, $ travelling in air, enters a glass medium whose refractive index is 1.5 then,
jeemain
physics
class12
unit16
wave-optics
introduction-to-wave-optics
easy
asked
Feb 19, 2014
by
meena.p
1
answer
A non-conducting disc of radius a and uniform +ve surface charge density $\; \sigma\;$ is placed on the ground with it 's axis vertical . A particle of mass m and +ve charge q is dropped , along the axis of the disc from a height H with zero initial velocity . Find the value of H if the particle just reaches the disk .$\;\large\frac{q}{m}=4 \in_{0} g/\sigma$ . Find the position of particle at which the particle is in equilibrium
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
A non-conducting disc of radius a and uniform +ve surface charge density $\; \sigma\;$ is placed on the ground with it 's axis vertical . A particle of mass m and +ve charge q is dropped , along the axis of the disc from a height H with zero initial velocity . Find the value of H if the particle just reaches the disk .$\;\large\frac{q}{m}$$=4 \in_{0} g/\sigma$
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
Two lenses , One concave and the other convex of same power are placed such that their principal axes coincide. If the separation b/w the lenses is x, then ,
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 18, 2014
by
meena.p
1
answer
A $16\;cm$ long image of an object is formed by a convex lens on a screen. On moving the lens towards the screen with out changing the positions of object an image of size 9 cm is again formed again on the screen . The size of object is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
easy
asked
Feb 18, 2014
by
meena.p
1
answer
A thin equiconvex lens of refractive index $\large\frac{3}{2}$ and radius of curvature 30 m is put in water $(RI= \large\frac{4}{3})$. Its focal length is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 18, 2014
by
meena.p
1
answer
A lens of focal length f projects m times magnified image of an object on a screen.The distance of screen from lens is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
easy
aims-12-physics
asked
Feb 18, 2014
by
meena.p
1
answer
The region between two concentric shells of radii a and b $\;(b > a)\;$ contains volume charge density $\;\rho(r)=\large\frac{C}{r}\;$ , where C is a constant and r is the radial distance , as shown in figure . A point charge q is placed at the origin , r=0 . Find the value of C for which the electric field in the region between the spheres is constant.
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
gausss-law
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
A rectangular tank of mass $\;m_{0}\;$ and charge Q over it is placed over a smooth horizontal floor. A horizontal electric field E exist in the region . Rain drops are falling vertically in the tank at the constant rate of n drops per second . Mass of each drop is m . find velocity of tank as function of time .
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
The maximum electric field intensity inside a sphere of radiusR is
jeemain
physics
class12
ch1
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
A ray of light passes through an equilateral prism such that the angle of incidence and the angle of emergence are equal to $\large\frac{3}{4}th$ of the angle of prism. The angle of minimum deviation is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
medium
asked
Feb 18, 2014
by
meena.p
1
answer
The point $\;r_{m}\;$ inside the sphere of a sphere of radius R at which electric field intensity is maximum , is given by
jeemain
physics
class12
ch1
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
The magnitude of the electric field as a function of the distance r outside the ball is given by
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
A ray of light traveling in a transparent medium falls on a surface separating the medium from air at an angle of incidence of $45^{\circ}$ The ray undergoes total internal reflection . If n is the refractive index of medium with respect to air, select the possible value of n from following
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
medium
asked
Feb 18, 2014
by
meena.p
1
answer
A diminished image of an object is to be obtained on a screen 1. m away from it . This can be achieved by approximately placing.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Feb 18, 2014
by
meena.p
1
answer
A ray of light passes through four transparent media with refractive indices $\mu_1,\mu_2,\mu_3$ of all media are parallel, If the emergent ray CD is parallel ti incident ray AB. We must have
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
easy
asked
Feb 18, 2014
by
meena.p
1
answer
The magnitude of electric filed as a function of the distance r inside the sphere is given by
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
Two plane mirrors A and B are aligned parallel to each other as shown. A light ray is incident at an angle of $30^{\circ}$ at a point just inside one end of A. The plane of incidence coincides with place of figure. The maximum number of time the ray undergoes reflections (including the first one ) before it emerges out is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
easy
asked
Feb 18, 2014
by
meena.p
1
answer
There are two concentric spherical shells of radii r and 2r . Initially a charge Q is given to the inner shell . Now , switch $\;S_{1}\;$ is closed and opened then $\;S_{2}\;$ is closed and opened and the process is repeated n times for both the keys alternatively . Find the final potential difference between the shells
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
In the ideal YDSE , when a glass plate $(refractive index\;1.5)$ of thickness t is introduced in path of one of interfering beams (wave - length $\lambda$) the intensity at position where central maximum occurred preciously remains unchanged . The minimum thickness of glass plate is :
jeemain
physics
class12
unit16
wave-optics
optics
youngs-double-slit-experiment
medium
asked
Feb 18, 2014
by
meena.p
1
answer
A simple pendulum with a bob of mass m=1 kg , charge $5\;mu C \;$ and string length l=1m is given a horizontal velocity u in a uniform electric field $\;E=2\times10^{6} V/m\;$ at its bottom most point as shown in figure . It is given that the speed u is such that the particle leaves the circle at point C . Find approx the speed u in m/s (Take g=10 m/s^2)
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
A mass m is to be placed on the rod of length L and pivoted at its centre at a distance x from the left end of the rod so that the system shown in figure remains in equilibrium . Find x (Ignore the force between Q (beaneth q ) and 2q and the force between Q (beneath 2q) and q .
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
force-between-multiple-charges
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
The electric potential varries in space according to the relation V= 4x+3y . A particle of mass 1 kg starts from rest from point $\;(8 , 3.9 m )\;$ under the influence of this field . Find the velocity of the particle when it crosses the y - axis . The charge on the particle ic $\;+1 \mu C$ .
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
A particle of mass m and charge -Q is constrained to move along the axis of a ring of radius R .The ring carries a uniform charge density $\;+ \lambda\;$ along its length . Initially the particle is in the centre of the ring . Now it is displaced slightly along the axis of ring it's time period of oscillation is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
Two conducting concentric , hollow sphere A and B have radii a and b respectively with A inside B . Their common potentials is V . A is now given some charge such that its potential becomes zero . The potential of B will now be
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy-of-a-system-of-charges
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
In a uniform electric field , the potential is $10\;V$ at the origin of coordinates and $8V$ at each of the points $(1 ,0 ,0) ,(0 , 1 ,0)\;and\;(0 ,0,1)\;.$ The potential at the point $\;(1 ,1 ,1)\;$ will be
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy-of-a-system-of-charges
difficult
asked
Feb 18, 2014
by
yamini.v
1
answer
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