Which of the following is used in a fire alarm?

The magnetic field produced by a current-carrying solenoid depends directly upon the strength of the current.

How is a circuit overloaded?

$(a)$ $A$ coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is:
$(i)$ pushed into the coil with its north pole entering first?
$(ii)$ withdrawn from inside the coil?
$(iii)$ held stationary inside the coil?
$(b)$ Name the above phenomenon and mention the name of the scientist who discovered it. State the law that relates the direction of current in the coil with the direction of motion of the magnet.

Explain why a fuse should be joined with the live wire and not with the neutral wire in a domestic circuit.

Which rule is used to determine the direction of induced current in a circuit?