Physics

ICSE Class 12

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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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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 θ_{n} in terms of α and β.

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 θ

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9.
An electron, moving with a velocity of 5 x 10^{7} ms^{-1}, enters a magnetic field of 1 wb m^{-2} at an angle of 30°. Calculate the force on the electron.

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The sensitivity of a moving coil galvanometer depends upon:

(a) The value of n, i.e., number of turns.

(b) The value of B, i.e., intensity of magnetic field.

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