Current and Voltage Sensitivity of a Galvanometer - Param Himalaya

Sensitivity of a Galvanometer

A galvanometer is said to be sensitive if a small current flowing through the coil of galvanometer produces a large deflection in the galvanometer. 

(i) Current Sensitivity: 

The current sensitivity of a Galvanometer is defined as the deflection produced in the coil of the galvanometer per unit current flowing through it.

$$Current \ sensitivity = \frac{\phi}{I}$$

$$Current \ sensitivity = \frac{\phi}{\frac {k\phi}{NAB}}$$

$$Current \ sensitivity = \frac{\phi NAB}{k\phi}$$

$$Current \ sensitivity = \frac{NAB}{k}$$

Current sensitivity can be increased by : 

(a) Increasing N 

(b) Increasing B 

(C) Increasing A

(d) Decreasing k 

(ii) Voltage sensitivity: 

Voltage sensitivity of a Galvanometer is defined as the deflection produced in the coil of the galvanometer per unit voltage applied to it. 


$$Voltage sensitivity= \frac{\phi}{V}$$

$$Voltage sensitivity= \frac{\phi}{IR}$$

$$Voltage\ sensitivity = \frac{\phi} {\frac{k\phi R}{(NAB)}}$$

$$Voltage\ sensitivity = \frac{\phi (NAB)}{k\phi R}$$

$$Voltage \ sensitivity = \frac{NAB}{kR}$$

Voltage sensitivity can be increased by : 

(a) Increasing N 

(b) Increasing B 

(C) Increasing A

(d) Decreasing k 

(e) Decreasing R

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