Recent questions in Physics

Which of the options represents Biot – Savart’s Law for a point charge particle Q moving with velocity $ \overrightarrow V$ ?

asked Feb 19, 2014 by thanvigandhi_1

1 answer

A circular beam of diameter $d=2 \;cm$ falls on a plane surface of glass . The angle of incidence is $60^{\circ}$ and refractive index of glass is $ \mu=\large\frac{3}{2}$. The diameter of the refracted beam is ,

asked Feb 19, 2014 by meena.p

1 answer

In a region a horizontal electric field $E = 15N/C$ is present. A ball having charge $2C$ , mass $3kg$ and coefficient of restitution with ground $\;\large\frac{1}{2}\;$ is projected at an angle $\;30^{\circ}\;$ with the horizontal distance travelled by ball from first drop to the second drop

asked Feb 19, 2014 by yamini.v

1 answer

A concave mirror has a focal length 20 cm. The distance between the two positions of object for which the image size is double of object size.

asked Feb 19, 2014 by meena.p

1 answer

A convex lens forms a real image 3 times larger than the object on a screen. Object and screen are moved until the image becomes twice the size of object. If the shift of object is $6\;cm$ The shift of screen is :

asked Feb 19, 2014 by meena.p

1 answer

Given the scenario that follows, what will be $y$-coordinate of the particle when it collides with the screen? A particle having charge $q = 1C$ and mass = $1Kg$ is released from rest at the origin. The region has Electric and Magnetic fields given by: $E = 10 \hat I N/C$ for $x \leq 1.8m$ and $B = -5 \hat k T$ for $1.8m \leq x \leq 2.4m$. A screen is placed at $x = 3.0m$ parallel to the $y-z$ plane. Gravity is to be neglected.

asked Feb 19, 2014 by thanvigandhi_1

1 answer

A conducting ring of mass 2 Kg and radius $0.5m$ is placed on a smooth horizontal surface. The ring carries a current $i = 10A$. A horizontal magnetic field $B = 4T$ is now switched on. The angular acceleration of the ring will be

asked Feb 19, 2014 by thanvigandhi_1

1 answer

In YDSE $\large\frac{d}{D}$$=10^4$ (d= distance between slits ; D= distance of screen from slits). at a point P on screen resulting intensity is equal to intensity due to individual slit $I_0$ Then the distance of point P from central maximum is $(\lambda= 6000 A^{\circ})$

asked Feb 19, 2014 by meena.p

1 answer

Refraction takes place at a concave spherical boundary separating glass air medium. For image to be real the object distance $(\mu g=\large\frac{3}{2})$

asked Feb 19, 2014 by meena.p

1 answer

A 2 cm diameter coin rests flat on the bottom of a bowl in which water is 20 cm deep $(\mu_w= \large\frac{4}{3})$. If the coin is viewed directly from above what is its apparently diameter?

asked Feb 19, 2014 by meena.p

1 answer

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.

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 $\;\quad \;$

asked Feb 19, 2014 by yamini.v

1 answer

Magnetic moment of an electron in the $n^{th}$ orbit of the hydrogen atom is

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

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

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

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

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

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

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

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

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

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

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

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 .

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?

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

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

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)

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

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

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

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

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 :

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,

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

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$

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 ,

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

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

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

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.

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 .

asked Feb 18, 2014 by yamini.v

1 answer

The maximum electric field intensity inside a sphere of radiusR is

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

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

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

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

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.

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

asked Feb 18, 2014 by meena.p

1 answer

Ask Questions, Get Answers