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Q.

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

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a

40  Ω

b

25  Ω

c

250  Ω

d

500  Ω

answer is C.

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Detailed Solution

Current sensitivity θi= 510−3  =  5000  divA        ....ivoltage sensitivity θV=20   divV        ....iii/ii we get  θ/iθ/V=500010 =250⇒      Vi=R=250  Ω
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