A wire of length $L$ is made in the form of a coil in a moving coil galvanometer. To have maximum sensitiveness the shape of the coil is

circular

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elliptical

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rectangular

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square

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Solution

The correct option is A circular
For a fixed given length of a wire area is maximum when it is bent in a circular shape.
Sensitivity is dependent on area of the coil. So, more area, more sensitivity of galvanometer.

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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.

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A wire of length L is made in the form of a coil in a moving coil galvanometer. To have maximum sensitiveness the shape of the coil is

The correct option is A circularFor a fixed given length of a wire area is maximum when it is bent in a circular shape.Sensitivity is dependent on area of the coil. So, more area, more sensitivity of galvanometer.

A wire of length $L$ is made in the form of a coil in a moving coil galvanometer. To have maximum sensitiveness the shape of the coil is

The correct option is A circular
For a fixed given length of a wire area is maximum when it is bent in a circular shape.
Sensitivity is dependent on area of the coil. So, more area, more sensitivity of galvanometer.