Question

1. explain why does a current in a galvanometer move a pointer?

Explanation:

A galvanometer operates based on the principle of the interaction between a magnetic field and an electric current. When a current passes through the coil of the galvanometer, it creates a magnetic field around the coil. This magnetic field interacts with the permanent magnetic field of the galvanometer. According to the Lorentz force law, a force is exerted on the current - carrying coil. This force causes the coil to rotate. The coil is attached to a pointer. As the coil rotates, the pointer moves across a scale, indicating the magnitude of the current.

Answer:

A current in a galvanometer moves a pointer because when current flows through the coil of the galvanometer, it creates a magnetic field. This magnetic field interacts with the permanent magnetic field of the galvanometer. By the Lorentz force law, a force acts on the current - carrying coil, causing it to rotate. Since the coil is attached to a pointer, the rotation of the coil results in the movement of the pointer.