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Describe the working principle of a moving coil galvanometer. Why is it
necessary to use (i) a radial magnetic field and (ii) a cylindrical soft iron core
in a galvanometer? Write the expression for current sensitivity of the
galvanometer.
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Galvanometer works on the principle of conversion of electrical energy into mechanical energy. When a current flows in a magnetic field it experiences a magnetic torque. If it is free to rotate under a controlling torque, it rotates through an angle proportional to the current flowing through it.
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