What is the pattern of field lines inside a solenoid? What do they indicate?

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

$(i)$ Write the values of the following physical quantities in connection with domestic power supply in our country: $(a)$ potential difference between live wire and neutral wire.
$(b)$ frequency of $AC$.
$(ii)$ Explain the role of the following as safety measure in domestic electric appliances/circuits:
$(a)$ earth wire
$(b)$ fuse.

Which type of magnet is used in a crane to lift cars?

Mention the voltage and frequency of the electric current that we receive in our houses.

$A$ magnetic compass shows a deflection when placed near a current-carrying wire. How will the deflection of the compass be affected if the current in the wire is increased? Support your answer with a reason.