Question

Identify the definition of sensitivity of a galvanometer from the following.

(a) Ratio of unit change in unknown resistance to the deflection in the galvanometer

(b) Ratio of unit change in unknown resistance to twice the deflection in the galvanometer

(c) Ratio of deflection in the galvanometer to the unit change in unknown resistance

(d) Ratio of deflection in the galvanometer to half the unit change in unknown resistance

This question was posed to me at a job interview.

The above asked question is from Wheatstone Bridge topic in portion Current Electricity of Physics – Class 12

Answer 1

Right option is (c) Ratio of deflection in the galvanometer to the unit change in unknown resistance

To explain: Sensitivity of a galvanometer is defined as ratio of deflection in the galvanometer to the unit change in unknown resistance. Sensitivity of a galvanometer can be increased by increasing the number of turns, increasing the area of the coil, or using a strong magnet.