Question

What does the figure of merit (K) of a galvanometer represent?

Options

• The maximum current it can measure

• The current required for full-scale deflection

• The current through the galvanometer for unit deflection

• The total resistance of the galvanometer circuit

Answer 1

The current through the galvanometer for unit deflection

Explanation:

The figure of merit K = \[\frac {I}{θ}\], where I is the current and θ is the deflection in divisions. It represents the current needed to produce one division of deflection, and a smaller value of K means the galvanometer is more sensitive.