State the underlying principle of working of a moving coil galvanometer. Write two reasons why a galvanometer cannot be used as such to measure current in a given circuit. Name any two factors on which the current sensitivity of a galvanometer depends.

Asked by Topperlearning User | 20th May, 2015, 02:33: PM

Expert Answer:

The underlying principle for the working of a moving coil galvanometer is that when a current-carrying conductor is placed inside a magnetic field, it experiences a magnetic force.
The two reasons why a galvanometer cannot be used for measuring current are:

  1. The high resistance of galvanometer can disturb the original current flowing through the circuit
  2. The high current present in the circuit can destroy the coil windings present in the galvanometer


The factors on which the current sensitivity of a galvanometer depends are:

  1. Number of turns in the coil
  2. Torsional spring constant
  3. Area of the coil
  4. Strength of the magnetic field

Answered by  | 20th May, 2015, 04:33: PM