(a) Draw a labellel diagram of a moving coil galvanometer. Describe briefly its principle and working. (b) Answer the following: (i) Why is it necessary to introduce a cyclindrical soft iron core inside the coil of a galvanometer? (ii) Increasing the current sensitivity of galvanometer may not necessarily increase its voltage sensitivity. Explain,giving reason.

(a) Draw a labellel diagram of a moving coil galvanometer. Describe br

1.	(a) Draw a labellel diagram of a moving coil galvanometer. Describe briefly its principle and working. (b) Answer the following: (i) Why is it necessary to introduce a cyclindrical soft iron core inside the coil of a galvanometer? (ii) Increasing the current sensitivity of galvanometer may not necessarily increase its voltage sensitivity. Explain,giving reason.
Answer» Solution :(a) Principle and working : A CURRENT carrying coil, placed in a UNIFORM magnetic field, (can) experience a torque Consider a rectangular coil for which no. of TURNS = N. (b) (i) The SOFT iron core not only makes the field radialbut also increases the strength of themagnetic field. (ii)

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