Question

In the half deflection method, a resistance R is in series with a galvanometer. When deflection becomes half, find the galvanometer resistance G.

Options

• G = R/2

• G = R

• G = 2R

• G = R²

Answer 1

G = 2R

Explanation:

In the half deflection method, when the galvanometer shows exactly half of full-scale deflection, the resistance of the galvanometer is calculated as G = 2R, where R is the known series resistance. This relationship holds under the approximation that the shunt resistance is much smaller than G.