Identify the type of magnetic fields represented by the magnetic field lines given below and name the type of conductors which can produce them.

On which principle does an electric bell work?

$A$ 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.

Describe an experiment to illustrate the action of an electric fuse.

What does the divergence of magnetic field lines near the ends of a current-carrying straight solenoid indicate?

$(i)$ 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.