state the principle of working of moving coil galvanometer?

Solution

Working principle of the moving coil galvanometer:
 
When a current flows through the coil, a torque acts on it. The magnetic torque  tends to rotate the coil. A spring provides a counter torque that balances the magnetic torque resulting in a steady angular deflection  .
 
Construction of a moving coil galvanometer

The galvanometer consists of a coil, with many turns, free to rotate about a fixed axis, in a uniform radial magnetic field. There is a cylindrical soft iron core which not only makes the field radial but also increases the strength of the magnetic field.When a current flows through the coil, a torque acts on it.The magnetic torque tends to rotate the coil. A spring provides a counter torque that balances the magnetic torque, resulting in a steady angular deflection. The deflection is indicated on the scale by a pointer attached to the spring.

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