Question

A moving coil galvanometer requires a current of 100A for full scale deflection of 50 divisions . If galvanometer resistance is 100 ohm , find voltage sensitivity and current sensitivity

Answer 1

Answer:

Explanation:

Voltage Sensitivity: The deflection of galvanometer per unit voltage is called voltage sensitivity of a galvanometer. Hence increasing the current sensitivity may not necessarily increase the voltage sensitivity of a galvanometer.

In moving coil galvanometer voltage sensitivity is openly comparative to the number of turns & is inversely proportional to the resistance but on increasing the number of turns length of wire increases which increases the resistance of the wire this shows sensitivity increases on increasing the resistance.

Voltage sensitivity = theta/IR

Theta is deflection created

Hence Vs= 50/(100*100) =0.005

Current sensitivity, Is=theta/I

=50/100

=0.5