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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Amount of work done in turning the dipole through 360Â° is,

W = -PE [cos Î¸_{1}Â - cos Î¸_{2}]

Â Â = -PE [cos 0Â° - cos 360Â°]

Â Â = 0.Â

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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 Î©, 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 =Â Â ;Â

where Î¸ is the difference in temperature of the hot junction over the cold junction and Î± and Î² are constants.

Express the neutral temperature Î¸_{n}Â in terms of Î± and Î².

E =Â Â ;Â

where Î¸ is the difference in temperature of the hot junction over the cold junction and Î± and Î² are constants.

Express the neutral temperature Î¸

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

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