wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The current sensitivity of a moving coil galvanometer can be increased by


A

Increasing the magnetic field of the permanent magnet

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B

Increasing the area of the deflecting coil

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C

Increasing the number of turns in the coil

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D

Increasing the restoring couple of the coil

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C

Increasing the number of turns in the coil


Moving coil galvanometer:

1. A moving coil galvanometer is a device which is used to measure the intensity of electric currents.

2. It is a very sensitive electromagnetic instrument that can measure very low currents even of the order of a few milli or microamperes.

3. These types of galvanometers are mainly divided into two types:

3.1 Suspended coil galvanometer

3.2 Pivoted-coil or Weston galvanometer

Current sensitivity of the moving coil galvanometer:

The current sensitivity of the moving coil galvanometer is given by = nBAk

Here n= number of turns

A= area of the coil

B = magnetic field strength

k = the torsional constant of the spring (restoring couple per unit twist).

Therefore, we can increase current sensitivity by increasing the number of turns of the coil, increasing the magnetic field of the permanent magnet, and also increasing the area of the deflecting coil as evident from the equation.

As in the case of option D, if we increase the restoring couple of the coil k, current sensitivity will decrease. Thus, option D is incorrect.

Hence, the correct options are options A, B, and C.


flag
Suggest Corrections
thumbs-up
3
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Algebraic Identities
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon