State the underlying principle of working of a moving coil galvonometer. Write two reasons why a galvometer cannot be used as such to measure current in a given circuit. Name any two factors on which the current sensitivity of a galvonometer depends.

State the underlying principle of working of a moving coil galvonomete

1.	State the underlying principle of working of a moving coil galvonometer. Write two reasons why a galvometer cannot be used as such to measure current in a given circuit. Name any two factors on which the current sensitivity of a galvonometer depends.
Answer» Solution :A galvonometer cannot be USED as such to measure current directly in ampere in a given circuit due to following two REASONS: (i) Galvonometer is a very sensitive device and gives a full scale deflection for a current of the order of few microampere. (ii) For measuring current, the galvonometer is to be connected in SEIRES. As the galvonometer has a large resistance, it will change the value of the current in the circuit. The current sensitivity of a galvonometer is defined as the deflection per unit current. Thus, Current sensitivity, `= (phi)/I = (NAB)/(k)` From this relation it is clear that the current sensitivity depends on (i) the strength of radial MAGNETIC field, and (ii) the TORSIONAL constant of suspension/spring.

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State the underlying principle of working of a moving coil galvonometer. Write two reasons why a galvometer cannot be used as such to measure current in a given circuit. Name any two factors on which the current sensitivity of a galvonometer depends.

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