Question

The figure of merit k of a galvanometer is given by:

Options

• \[k=\frac{I}{\phi}=\frac{C}{NAB}\]

• \[k=\frac{\phi}{I}=\frac{NAB}{C}\]

• \[k=NIAB\]

• \[k=\frac{\phi}{V}=\frac{NAB}{CG}\]

Answer 1

The figure of merit \[k = \frac{I}{\phi} = \frac{C}{NAB}\] is the reciprocal of current sensitivity. A smaller \(k\) means less current is required per division of deflection, i.e., the galvanometer is more sensitive.