Question:

The current sensitivity of a moving coil galvanometer depends on

Updated On: Jun 7, 2022
  • the number of turns in the coil
  • moment of inertia of the coil
  • current sent through galvanometer
  • eddy current in Al frame
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The Correct Option is A

Solution and Explanation

Current sensitivity $=\frac{nBA}{K}$
where K is constant of torsional rigidity.
B is the magnetic field A is coil area.
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Concepts Used:

Electrical Instruments

There are various electrical instruments used to measure current, power, voltage, etc.  Some of them are briefly explained below:

Moving Coil Galvanometer

  • It is an electromagnetic device which measures small values of current.
  • Its working principle is that whenever a current loop is placed in a magnetic field, it experiences a certain torque. The value of that torque can be modified by modifying the current in the loop.
  • For a current carrying loop having N turns, and cross sectional area A, carrying current i, whenever it is placed in and along the direction of an external magnetic field B, it experiences a torque given by:

ԏ = NiAB

moving coil galvanometer