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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14800

1480

1500

1520

answer is B.

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Detailed Solution

$t o c o n v e r t a g a l v a n o m e t e r t o a v o l t m e t e r h i g h r e s i s \tan c e h a s t o b e c o n n e c t e d i n s e r i e s w h e r e i_{g} (R + G) = V h e r e 3 = 2 x 10^{- 3} (R + 20) R = 1480 o h m s$

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