$A$ device used for producing current is:

Draw a diagram to show how a magnetic needle deflects when it is placed above or below a straight conductor carrying current,depending on the direction of the current in the conductor.

Answer the following questions:
$(i)$ What is the direction of magnetic field lines outside a bar-magnet?
$(ii)$ Why two magnetic field lines cannot intersect each other?
$(iii)$ What is indicated by crowding of magnetic field lines in a given region?
$(iv)$ What is the frequency of $AC$ in India?
$(v)$ State one advantage of $AC$ over $DC$.

Draw an appropriate schematic diagram showing common domestic circuits and discuss the importance of a fuse. Why is it that a burnt-out fuse should be replaced by another fuse of identical rating?

State Faraday's laws of electromagnetic induction.

$(i)$ The given figure shows a domestic electric circuit. Study this circuit carefully. List any two errors in the circuit and justify your answer.
$(ii)$ Give one difference between the wires used in the element of an electric heater and in a fuse:
$(iii)$ List two advantages of parallel connection over series connection.