why in a moving coil galvanometer , torque in the loop due to radial B =torque in the spring

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Moving coil galvanometer operates on Permanent Magnet Moving Coil (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.

$(i i)$ To make the field radial in a moving coil galvanometer

Q. If the net force acting on a closed loop is zero then how can a torque act on it??? Moving coil galvanometer has a closed rectangular loop ...still it rotates in uniform magnetic field

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,

$(i v)$ 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

Q. (a) Obtain the expression for the torque on a loop placed in a uniform magnetic field.

(b) Describe the construction and working of a moving coil galvanometer.

Q. A moving coil galvanometer has a coil of effective area

A

and number of turns

N

. The magnetic field

B

is radial. If a current

I

is passed through the coil, the torque acting on the coil is.

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