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The surface charge density of sphere of radius r is sigma. It is placed at a point A. The electric field intensity at B due to this sphere is E. Another charged sphere os radius 2r is placed at B. If the intensity at the centre of A and B is E/2 then the surface charge density of B is

Two waves of intensities I and 4I superpose, then the﻿ maximum and minimum intensities are :﻿

0.bar5 को p/q के रूप में व्यक्त कीजिए

Give two definitions of mutual inductance, give its units and write factors on which its value depends.

Angle which the vector vec(A)=2hati + 3hatj makes with the y-axis is given by :

A lensof negligible thickness of focal length (f) has as aperture (d). If forms an image of intensity I. Now, the central partof aperture upto diameter d/2 is blocked by opaque paper. The focal length and image intensity will change to :

The equation Y = acos^(2)(2pi nt - (2pix)/lambda) represents a wave with:

When a current carrying loop is replaced by an equivalent magnetic dipole ........

Biot Savart law in vector form is represented as doversettoB.

Sketch the pattern of electric field lines due to an electric dipole.

When radiation of 400 nm wavelength Is incident on photocell ,emitter produces photoelectron with maximum kinetic energy of 1.68 eV work function of emitter will be………. [hc=1240 eVnm]

An ideal gas is initiaily at temperature T and volumoeV. lts volume is increased by Delta V due to an increase in temperature Delta T, pressure remaining constant. The quantity k = AV//(V Delta T) varies with temperature as:

If the accelerating voltage across an x-ray tube is doubled

Figure shows a process ABCA performed on an ideal gas. Find the net heat given to the system during the process.

Diffraction phenomenon is common in sound but not common in light. Why is it so?

Phasor's method is used for ……..

A generator produces a voltage that is given by V=240 sin 120t, where t is in seconds. The frequency and rms voltage are (1)

Which of the following have zero average value in a﻿ plane electromagnetic wave ?﻿

When radio waves passes through ionosphere, phase difference between space current and capacitive displacement current is

Two point charges of +Q each have been placed at the positions (-a //2, 0) and (a // 2, 0,0). The locus of the points where - Q charge can be placed such the that total electrostatic potential energy of the system can become equal to zero, is represented by which of the following equations ?

In the circuit if the energy of 8 mu F condenser is E, the energy of 4muF condenser is

Three equal resistors connected in series across a source of emf together dissipate 10 watt of power. What would be the power dissipated if the same resistances are connected in parallel acrsoss the same source of emf?

Suggest an ideal to convert a full wave bridge rectifier to a half wave rectifier by changing the connecting wire/s. Draw the diagram and explain your answer.

Light waves of wave length lambda propagate in a medium. If M and N are two points on the wave front and they are separated by a distance lambda//4, the phase difference between them will be (in radian)

"To emit a free electron from a metal surface a minimum amount of energy must be supplied"Give three method to supply energy to a free electron

The intensity of sun lighth (in W//m^(2)) at the solar surface will be:

The equivalent resistance of the combination across AB is .

A body is in pure rotation. The linear speed v of the particle, the distance r of the particle from the axis and the angular velocity omega of the body are related as omega=(v)/(r). Thus

A potential is given by V(x)=(x+alpha)^(2//2) for x lt 0 and V(X)=k(X-alpha)^(2//2) for xgt0. The schematic variation of oscillation pertiod (T) for a performing periodic motion in this potential as a function of its energy E is:

Unpolarised ligh of intensity 32 W"/"m^(2) passes through a polariser and analyer which are at ain angle of 30^(@) with respect to each other. The intensity of the light coming from analyser is

The atomic mass of m_("electron")=0.00055" amu ",m_("proton")=1.007593" amu "m_("neutron")=1.008982 amu. The binding energy per nucleon is ______ MeV (nearly)

A wire of length L is strech such that its diameter is reduced to half of its original diameter. If the initial resistance of the wire were 10 Omega, its new resistanc would be

A reel of massless thread unrolls itself falling down under gravity. The acceleration of its fall is :

Which is correctly matched is a normal menstrual cycle ?

A swimmer is capable of swimming 1.65 ms^(-1) in still water. If she swims directly across a 180m wide river whose current is 0.85 m/s, how far downstream (from a point opposite her starting point) will she reach?

The specific resistance of a wire is rho, it's volume is 3m^3 and its resistance is 3 ohm, then it's length will be:

Derive the expression from drift velocity of free electron in terms of relaxation time and electric field applied across a conductor.

A wooden ball of density p is dropped from rest from a height 'h' into the lake of water density sigma (sigma > p). Neglecting viscosity, the maximum depth to which the body sinks before returning to float is :

In the figure shown, what is the potential difference between the points A and B between a and C respectively in steady state?

Above the Curie temperature, thesusceptility of aferromagentic substance varies

What we call the number of electrons/protons in an atom ?

How do we define photoelectric work function and how it is related to threshold frequency ?

How are the different emfs generated in a three-plane AC generator? Show the graphical representation of theses emfs.

Two waves of intensities I and 4I superpose, then the maximum and minimum intensities are :

Which of the following have zero average value in a plane electromagnetic wave ?