GEOLOGY

Detailed explanation-1: -The electric current produces the magnetic field because it also has the motion due to the movement of electrons from a negative to a positive end. The direction of the magnetic field is determined by the direction of the movement of electrons.

Detailed explanation-2: -Alternating electric current flows through the solenoid on the left, producing a changing magnetic field. This field causes, by electromagnetic induction, an electric current to flow in the wire loop on the right.

Detailed explanation-3: -There is an electric current in a wire because there is an electric field inside the wire. It’s this electric field that pushes the free electrons to get them to move along.