Moving coil galvanometer operates on Permanent Magnet Moving Coll (PMMC) mechanism.

Moving coil galvanometers are of two types
(i) Suspended coil
(ii) Pivoted coil type or tangent galvanometer,

Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque. This torque tends to rotate the coil about its axis of suspension in such a way that the magnetic flux passing through the coil is maximum.

$(v)$ To increase the current sensitivity of a moving coil galvanometer, we should decrease

strength of magnet

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

torsional constant of spring

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

number of turns in coil

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

area of coil

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

Open in App

Solution

The correct option is B torsional constant of spring
Current sensitivity of galvanometer is
$\frac{ϕ}{I} = S_{i} = \frac{N A B}{k}$

Hence to increase current sensitivity torsional constant of spring must decrease

Suggest Corrections

Similar questions

Moving coil galvanometer operates on Permanent Magnet Moving Coll (PMMC) mechanism.

Moving coil galvanometers are of two types
(a) Suspended coll
(b) Pivoted coil type or tangent galvanometer,

Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque. This torque tends to rotate the coil about its axis of suspension in such a way that the magnetic flux passing through the coil is maximum.

$(i v)$ In a moving coil galvanometer, having a coil of $N$ -turns of area $A$ and carrying current $I$ is placed in a radial field of strength $B$ . The torque acting on the coil is