What is the nature of the magnetic field lines inside a current-carrying solenoid?

When an electric current flows through a conducting wire,what is produced in the region around it?

State the principle of an electric generator.

$A$ beam of alpha particles enters a chamber moving along a magnetic field. What is the magnetic force experienced by the beam?

$A$ coil made of insulated copper wire is connected to a galvanometer. What will happen to the deflection of the galvanometer if this coil is moved towards a stationary bar magnet and then moved away from it? Give reason for your answer and name the phenomenon involved.

If you strike a sharp edge of a metallic knife against the north pole of a bar magnet,it will induce a north pole.