What is the function of an earth wire? Why is it necessary to earth metallic appliances?
When does an electric short circuit occur?
Explain the underlying principle and working of an electric generator by drawing a labeled diagram. What is the function of brushes?
State the rule to determine the direction of an
(i) magnetic field produced around a straight conductor carrying current,
(ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and
(iii) current induced in a coil due to its rotation in a magnetic field.
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is
(i) pushed into the coil,
(ii) withdrawn from inside the coil,
(iii) held stationary inside the coil?