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Recent questions tagged physics
Questions
What is the dimensional formula for resistivity?
jeemain
physics
current-electricity
cbse
class12
ch5
resistivity
medium
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
A 5V battery with internal resistance $2\Omega$ and a 2V battery with internal resistance $1\Omega$ are connected to a $ 10 \Omega $ resistor as shown in the figure. The current in the $ 10\Omega $ resistor is
jeemain
physics
current-electricity
cbse
class12
ch5
ohms-law
medium
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
An equi - convex lens of crown and equi convex lens of flint glass make an achromatic system. The radium of curvature of convex lens is $0.54\;m$. If the focal length of combination for mean colour is 1.5 m and $RI$ for crown glass are $\mu _R= 1.53$ and $\mu_v =1.55$ Then the dispersive power of flint glass is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
dispersion
difficult
asked
Feb 14, 2014
by
meena.p
1
answer
Consider a block of conducting material of resistivity $ \rho$ shown in the figure. Current I enters at A and leaves from D. We apply superposition principle to find voltage $ \Delta V$ developed between B and C. The calculation is done in the following steps. \[\] (i) Take current I entering from A and assume it to spread over a hemispherical surface in the block. \[\] Calculate field E(r) at distance r from A by using ohm's law $E= \rho j$, where j is the current per unit area at r. \[\] (iii) From the r dependence of E(r) obtain the potential V(r) at r. \[\] (iv) Repeat (i), (ii) and (iii) for current I leaving D and superpose results for A and D \[\] For current entering at A, the electric field at a distance r from A is
jeemain
physics
current-electricity
cbse
class12
ch5
ohms-law
gausss-law
medium
asked
Feb 14, 2014
by
thanvigandhi_1
1
answer
Consider a block of conducting material of resistivity $ \rho$ shown in the figure. Current I enters at A and leaves from D. Apply the superposition principle and find the voltage $ \Delta V$ developed between B and C?
jeemain
physics
current-electricity
cbse
class12
ch5
ohms-law
difficult
asked
Feb 14, 2014
by
thanvigandhi_1
1
answer
In a YDSE $\lambda =60 \;nm\; D= 2m\;\lambda=6 mm$. Find the positions of a point lying b/w third maxima and third minima where the intensity in three - fourth of maximum intensity on the screen .
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
difficult
asked
Feb 14, 2014
by
meena.p
1
answer
When the screen is moved away from plane of slits in YDSE then the effect on interference fringes is
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 14, 2014
by
meena.p
1
answer
In an interference arrangement similar to YDSE , Slits $S_1\;and \;S_2$ are illuminated with coherent microwave sources and are synchronized to have zero phase difference The slits are separates by distance $d= 150 \;m$. The intensity $I_0$ is measured as a function of $\theta$ where $\theta$ is defined as shown. If $I _0$ is max intensity, calculate $I_0$ for $\theta=90^{\circ}$
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
difficult
asked
Feb 14, 2014
by
meena.p
1
answer
A parallel plate capacitor with air between the plates has a capacitance of $9\: pF$. The separation between the plates is $d$ . The space between the plates is now filled with two dielectrics. One of the dielectrics has dielectric constant $k_1=3$ and thickness $ \large\frac{d}{3}$ while the other has dielectric constant $k_2=6$ and thickness $ \large\frac{2d}{3}$. Capacitance of the capacitor is now
jeemain
physics
cbse
class12
ch4
electrostatics
electrostatic-potential-and-capacitance
effect
-of-dielectric-on-capacitance
medium
asked
Feb 14, 2014
by
thanvigandhi_1
1
answer
Shown in the figure below is a meter-bridge setup with null deflection in the galvanometer.The value of the unknown resistor $R$ is
jeemain
physics
current-electricity
cbse
class12
ch5
meter-bridge-and-potentiometer-instrumentation
easy
asked
Feb 14, 2014
by
thanvigandhi_1
1
answer
A thin plano- convex lens of focal length f is split into two halves one of halves is shifted along the optical axis. The separation b/w object and image plane is 1.8 m. The magnification of image formed by one of half lenses is 2. Find the focal length of lens and separation b/w the two halves.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 14, 2014
by
meena.p
1
answer
Calculate the effective resistance between points A and B
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
medium
asked
Feb 14, 2014
by
thanvigandhi_1
1
answer
What is the average drift speed of conduction electrons in a copper wire of cross-sectional area $1.0 \times 10^{–7}m^2$ carrying a current of $1.5 A$. Assume that each copper atom contributes roughly one conduction electron. The density of copper is $ 9.0 \times 10^3 kg/m^3 $ , and its atomic mass is $ 63.5 u.$
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
difficult
asked
Feb 14, 2014
by
thanvigandhi_1
1
answer
The cross section of glass prism has the form of an isosceles triangle . One of equal face is silvered. A ray of light incident normally on other equal face and after being reflected twice, emerges through base of prism along normal. That the angle of prism is :-
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
medium
asked
Feb 14, 2014
by
meena.p
1
answer
At what temperature would the temperature of a copper conductor be double its value at $0^{\circ}C\: \alpha_{Cu} = 4 \times 10^{-3}$
jeemain
physics
current-electricity
cbse
class12
ch5
resistivity
medium
asked
Feb 14, 2014
by
thanvigandhi_1
1
answer
Which of the following is an example of ohmic conductor:
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 14, 2014
by
thanvigandhi_1
1
answer
Two identical charged spheres are suspended by strings of equal length . The strings make an angle of $\;60^{0}\;$ with each other . When suspended in a liquid of density $\;0.5 g/cc,\;$ the angle remains the same . The dielectric constant of the liquid is [density of material of sphere is $\;1.5 g/cc\;$]
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
asked
Feb 14, 2014
by
yamini.v
2
answers
A lens has a power of +5 diopter in air what will be its power if completely immersed in water ? $ \mu_g =\large\frac{3}{2};$$ \mu_w=\large\frac{4}{3}$
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 14, 2014
by
meena.p
1
answer
A point source of light is placed at the bottom of a tank containing a liquid $(R.I= \mu)$ upto a depth $h$. A bright circular spot is seen on the surface of the liquid. Then the radius of this bright spot.:
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
total-internal-reflection
difficult
asked
Feb 14, 2014
by
meena.p
1
answer
In the figure shown for an angle of incidence i at the top surface , What is the minimum refractive index needed for total internal reflection at vertical face ?
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
total-internal-reflection
difficult
asked
Feb 14, 2014
by
meena.p
1
answer
A particle of mass m and charge +q is projected from the origin with a speed v at an angle $\;30^{0}\;$ with the horizontal into an electric field of intensity E directed downward . Equation of trajectory of particle is . Neglect gravity
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
asked
Feb 14, 2014
by
yamini.v
1
answer
A particle of charge -q and mass m moves in a circle of radius r arround an infinitely long line charge of linear density $\;+\lambda\;$ . Then time period will be
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
difficult
asked
Feb 14, 2014
by
yamini.v
1
answer
Three concentric spherical metallic shells A , B and C of radii a , b and c $\;(a < b < c)\;$ have charge densities $\;\sigma , - \sigma \; and \; \sigma\;$ respectively . If the shells A and C are at the same potential then the relation between a , b and c is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 14, 2014
by
yamini.v
1
answer
A 10.0 Kg block carrying a charge 100 $\;\mu C\;$ is connected to a spring for which $\;K=100 N/m\;$ . The block lies on a frictionless horizontal track , and the system is immersed in a uniform electric field $\;E=5\times10^{5}\;V/m\;$ , directed as shown in figure . If the block is released from rest when the spring is amount does the spring expand
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
asked
Feb 14, 2014
by
yamini.v
1
answer
A point charge q is placed on the top of a cone of serni-vertex angle $\;\theta\; $ Find the electric flux through the base of the cone
jeemain
physics
class12
electric-charges-and-fields
electrostatics
gausss-law
difficult
asked
Feb 14, 2014
by
yamini.v
1
answer
The current in the primary circuit of a potentiometer is $0.2 A$. The specific resistance and cross-section of the potentiometer wire are $4 \times 10^{-7} ohm $ meter and $8 \times 10^{-7} \: m^2$ respectively. The potential gradient will be equal to:
jeemain
physics
current-electricity
cbse
class12
ch5
meter-bridge-potentiometer-and-instrumentation
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
If $400ohms $ of resistance is made by adding four $ 100 \: ohm $ resistances of tolerance 5%, then the tolerance of the combination is:
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Time constant of a $RC$ circuit is $2/ln(2) s$. Capacitor is discharged at time $ t = 0$. The ratio of charge on the capacitor at time $t = 2s$ and $t = 6s$ is
jeemain
physics
electromagnetic-induction
cbse
class12
ch3
q98
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
The potential difference across the terminals of the battery (with $2\;ohms$ internal resistance) is
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
The current passing through the $ 3\Omega$ resistor is
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Under what conditions, can the current passing through the resistance R be increased? r1 and r2 are the internal resistances of the two batteries.
jeemain
physics
current-electricity
cbse
class12
ch3
cells-emf-and-internal-resistance
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
In a modified YDSE a monochromatic uniform and parallel beam of light of wavelength 6000 A and intensity $\bigg(\large\frac{10}{\pi}\bigg) \large\frac{w}{m^2}$ is incident normally on two circular operates A and B of radii $0.001\;m $ and $0.002\;m$ respectively. A perfectly transparent film of thickness $2000 A^{\circ}$ and refractive index $1.5 $ for wavelength $6000\;A^{\circ}$ is placed in front of aperture A. Calculate the pour (in waters) received at Focal spot F of lens. The lens is symmetrically placed with respect to aperture. Assume $10 \%$ of power received by each aperture goes in original direction and is bought to focal speet.
jeemain
physics
class12
wave-optics
youngs-double-slit-experiment
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
An inductor of inductance $ L = 400\: mH$ and resistors of resistances $R1 = 2\Omega$ and $R2 = 2\Omega$ are connected to a battery of $emf\: 12V$ as shown in the figure. The internal resistance of the battery is negligible. The switch $K$ is closed at $t= 0$. The potential drop across $L$ as a function of time is
jeemain
physics
electromagnetic-induction
cbse
class12
ch3
q94
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Two points $P$ and $Q$ are maintained at the potentials of $10V$ and $-4V$ respectively. The work done in moving $100$ electrons from $P$ to $Q$ is
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Two conductors have the same resistance at $0^{\circ} C$ but their temperature coefficients of resistance are $ \alpha 1 \: and \: \alpha 2$. The temperature coefficient for the parallel combination is
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Two conductors have the same resistance at $0^{\circ}C$ but their temperature coefficient of resistance are $ \alpha 1\: and \: \alpha 2$. The temperature coefficient for the series combination is
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
A beam of light consisting of two wavelength $6500 A^{\circ}$ and $5200 A^{\circ}$ is used to obtain interference fringes in a young's double slit exp. Then what is the distance from central maxima where the bright fringes due to both wavelength coincides? The distance between slits is 2 mm and distance between plane of slits and screen is 120 cm
jeemain
physics
class12
unit16
wave-optics
sec-b
youngs-double-slit-experiment
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
In the circuit shown below, the key K is closed at $ t = 0$. The current through the battery is
jeemain
physics
electromagnetic-induction
cbse
class12
ch6
inductance
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
The intensity of an electric field depends on the coordinates x and y as follows $\;\overrightarrow{E}=\large\frac{a\;(x \hat{i} + y \hat{j})}{x^2+y^2}\;$ where a is constants. Find the charge within a sphere of radius R with the centre at the origin
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 13, 2014
by
yamini.v
1
answer
A 4 cm thick layer of water covers 6 cm thick glass slab. A coin is placed at the bottom of slab and is being observed from the air side along the normal to surface. Then the apparent position of coin surface is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
In a YDSE with $D= 1m,d=1mm$ light of wave length $500 \;nm$ is incident at an angle of $0.57^{\circ}$ with respect to axis of symmetry of experimental set up. If centre of symmetry of screen is 0. Then the intensity at point 0 in terms of intensity of central maxima $I_0$ is
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 13, 2014
by
meena.p
1
answer
A charged +Q is uniformly distributed in a spherical volume of radius R . A particle of charge +q and mass m projected with velocity $\;v_{0}\;$ from the surface of the spherical volume to its centre inside a smooth tunnel dug across the sphere . The minimum value of $\;v_{0}\;$ such that it just reaches the centre of the spherical volume is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 13, 2014
by
yamini.v
1
answer
Let C be the capacitance of a capacitor discharging through a resistor R. Suppose t1 is the time taken for the energy stored in the capacitor to reduce to half its initial value and t2 is the time taken for the charge to reduce to one-fourth its initial value. Then the ratio $ \large\frac{t1}{t2}$ will be
jeemain
physics
electrostatic-potential-and-capacitance
cbse
class12
ch3
charging-and-discharging-of-capacitors
difficult
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
In a YDSE with $d= 1mm$ and $D= 1m$ slabs of $(t= 1 \mu m , \mu =3)$ and $(t=0.5\;\mu m , \mu =2) $ are introduced in front of upper and lower slit respectively . Then the shift in fringe pattern is :-
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
The current through the battery is
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
White light is used in a YDSE with $D= 1m$ and $d= 0.9 mm$ .Light reaching the screen at position $y= 1 mm$ is passed through a prism and its spectrum is obtained. The missing lines in the visible region of this spectrum is :-
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 13, 2014
by
meena.p
1
answer
Monochromatic light of wavelength $5000\;A^{\circ} $ is used in Y.D.S.E with slit- width $d= 1 mm$distance between screen and slits $D=1\;m$ Find the distance of 1000 th maxima
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
easy
asked
Feb 13, 2014
by
meena.p
1
answer
The net resistance between the points A and B is
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
difficult
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
In the circuit shown in the figure, reading of the voltmeter is V1 when only S1 is closed, V2 when only S2 is closed and V3 when both S1 and S2 are closed. Then
jeemain
physics
current-electricity
cbse
class12
ch5
ohms-law
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Monochromatic light of wavelength $5000\;A^{\circ} $ is used in Y.D.S.E with slit- width $d= 1 mm$distance between screen and slits $D=1\;m$ .Then the distance of 5th minima from central maxima on screen is :-
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 13, 2014
by
meena.p
1
answer
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