Question

The figure of merit of a galvanometer is:

Options

• The current required to produce a unit deflection (1 division) on the scale

• The deflection produced per unit current

• The maximum current the coil can carry without burning

• The deflection produced per unit voltage

Answer 1

The figure of merit \(k = I/\phi\) is the current needed to produce one division of deflection on the scale. It is the reciprocal of current sensitivity, so a smaller figure of merit indicates a more sensitive galvanometer.