In an electric motor,a loop with many turns is arranged on an axis. What is it called?

In an electric circuit,a fuse is used because $......$

On which principle is electricity generated in a power plant?

$(a)$ Explain any three properties of magnetic field lines.
$(b)$ Give two uses of magnetic compass.

$(a)$ When do we state that an electrical appliance is earthed? Mention the function of the earth wire in electric lines. Why is it necessary to earth electric appliances having a metallic body?
$(b)$ Explain what is short-circuiting and overloading in an electric supply.

Explain with the help of a figure the ring system of wiring in domestic wiring.