Q. How will the voltage sensitivity of a moving coil galvanometer change, if its current sensitivity is doubled?

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A

Double

B

Half

C

No change

D

Four times

Solution:

The current sensitivity of the galvanometer is deflection per unit current, .…(i)
Similarly, the voltage sensitivity is deflection per unit voltage,
....(ii)
From (i) and (ii),

Now, if current sensitivity is doubled, then the resistance in the circuit will also double as it is proportional to the length of the wire.
Hence, voltage sensitivity will be,

Hence, voltage sensitivity will remain unchanged.

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