Q.

A galvanometer has a resistance of 20 ohms , a current of 2 mA gives full scale deflection. The necessary resistance in ohms  to convert this galvanometer into voltmeter of range 0 – 3 V is

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a

14800

b

1480

c

1500

d

1520

answer is B.

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Detailed Solution

to convert a galvanometer to a volt meter  high resistance has to be connected in series  where      igR+G = V here 3 =2 x 10-3R+20 R = 1480 ohms
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A galvanometer has a resistance of 20 ohms , a current of 2 mA gives full scale deflection. The necessary resistance in ohms  to convert this galvanometer into voltmeter of range 0 – 3 V is