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How does a moving coil galvanometer works?

 A current carrying conductor placed placed in a magnetic field experinces a force. This principle is employed in the working of a moving coil galvanometer.I n an MCG  a coil carrying current is placed in a uniform magnetic field which experiences a force, under that force the coil deflects and the deflection is made proportional to the current.

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Ans : It is used to indicate the presence, direction, or strength of a small electric current and is also used
          mainly to detect and compare currents.
             In the moving-coil galvanometer—the most common type—the coil is mounted on pivots or
             suspended by thin metal strips.
                                      The coil lies between the poles of a permanent magnet in such a way that it rotates
         when current flows through it. The direction of the rotation depends on the direction of the current through
         the coil,and the amount of rotation depends on the strength of the current. It is often used to indicate when
         the current in a circuit has been reduced to zero, same as in the operation of the Wheatstone bridge.
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A galvanometer is an electromechanical instrument used for detecting and indicating an electric current. A galvanometer works as an actuator, by producing a rotary deflection of a pointer, in response to electric current flowing through a coil in a constant magnetic field.
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