Question

Find the true statement.

(a) Ammeter is an instrument used to measure potential difference across any element in a circuit

(b) Voltmeter is an instrument used to measure current in a circuit

(c) Galvanometer constant is dimensionless

(d) Current sensitivity is expressed as the exact reverse of the galvanometer constant

This question was posed to me by my college professor while I was bunking the class.

I want to ask this question from Moving Coil Galvanometer in section Moving Charges and Magnetism of Physics – Class 12

Answer 1

Correct answer is (d) Current sensitivity is expressed as the exact reverse of the galvanometer constant

Easiest explanation: Current sensitivity is defined as the deflection produced in the galvanometer, when unit current flows through it.

IS = \(\frac {NAB}{k}\)  ………………1

The unit of current sensitivity is rad A^-1 or div A^-1.

From 1, we can understand that current sensitivity is expressed as the exact reverse of galvanometer constant (G = \(\frac {k}{NAB}\)).