Question

Define the current sensitivity of the galvanometer. Write its SI unit.

Answer 1

1. A galvanometer is a device used to detect and measure the magnitude of a small current.
2. It is a very sensitive electromagnetic device that can measure small currents even of the order of a few microamperes.
3. The current sensitivity of the galvanometer is defined as the ratio of deflection produced in the galvanometer to the current flowing through it. Mathematically, the current sensitivity of the galvanometer is given as $Si=\theta /I==nBA/k$

Here, B is the strength of the magnetic field in which the coil is suspended

I is current, $\theta$ is deflection

A is the area of the coil

n is the number of turns in the coil

k is the restoring torque per unit twist of the suspension string.

4. The SI unit of the current sensitivity of the galvanometer is division/ampere (or) radian/ampere.