NEET | 2018Current Electricity and Electrical InstrumentHard

Question

Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is

Options

A.

40 Ω

B.

25 Ω

C.

250 Ω

D.

500Ω

Solution

θi=5010-3=5000, θV=20⇒θ/iθ/V=500010=250 ⇒Vi=R=250Ω

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