Inside a solenoid,the magnetic field is constant in magnitude and direction.

$(a)$ $A$ coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is:
$(i)$ pushed into the coil with its north pole entering first?
$(ii)$ withdrawn from inside the coil?
$(iii)$ held stationary inside the coil?
$(b)$ Name the above phenomenon and mention the name of the scientist who discovered it. State the law that relates the direction of current in the coil with the direction of motion of the magnet.

The direction of the magnetic force acting on a current-carrying wire placed in a strong magnetic field can be determined by which rule?

What colour wire is used for earthing or grounding?

Can a freely suspended current-carrying solenoid stay in any direction? Justify your answer. What will happen when the direction of current in the solenoid is reversed? Explain.

You are given two identical-looking iron bars,out of which one of them is a magnet. Just using these two bars,how will you identify which one is a magnet?