Mention the shape of the magnetic field lines around a current-carrying straight conductor.

Why does a magnetic compass needle pointing North and South in the absence of a nearby magnet get deflected when a bar magnet or a current carrying loop is brought near it? Describe some salient features of magnetic lines of field concept.

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.

$A$ coil of insulated wire is connected to a galvanometer. Explain what happens if a bar magnet with its north pole towards one face of the coil is:
$(i)$ moved quickly towards the coil,
$(ii)$ kept stationary inside the coil,and
$(iii)$ moved quickly away from the coil?

Name two types of wiring systems adopted for domestic wiring.

Write any one method to induce current in a coil.