﻿ An electron, moving with a velocity of 5 x 107 ms-1, enters a m

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## ISC Class 12 Physics Solved Question Paper 2006

1. Can 8.6 x 10-19 coulomb of charge be given to a conductor ? Explain.
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2. What will be the nature of the electric potential at a place where the electric field E = 0 ?
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3. What is the work done in turning an electric dipole through 360° ?
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4. Why is a potentiometer preferred over a voltmeter in measuring the emf of a cell ?
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5. Two wires A and B of equal mass and of the same material are taken. The diameter of wire A is half the diameter of wire B. If the resistance of wire A is 24 Ω, calculate the resistance of wire B.
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6. In the circuit, the length of the wire AB = 400 cm. Where should the jockey, J be placed so that the galvanometer shows a zero deflection?

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7. The thermoelectric emf is given by,

E =  ;
where θ is the difference in temperature of the hot junction over the cold junction and α and β are constants.

Express the neutral temperature θn in terms of α and β.
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8. State the S.I. unit of the magnetic moment of a magnet, indicating its direction.
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# 9.An electron, moving with a velocity of 5 x 107 ms-1, enters a magnetic field of 1 wb m-2 at an angle of 30°. Calculate the force on the electron.

Here,

Charge, q = 1.6 x 10-190 C

Magnetic field, B = 1 Wb/m2

Angle, θ = 30°

Velocity, V = 5 x 107 ms-1.

F  = q (

= qvB sin
= 5 x 107 x 1.6 x 10-19 x 1 x sin 30o

= 8 x 10-12 x 1/2

= 4 x 10-12  N

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10. State two factors on which the sensitivity of a moving coil galvanometer depends.
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