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Q.

A galvanometer has 30 divisions and a sensitivity 16μA/div It can be converted into a voltmeter to read 3 V by connecting (G = 250Ω)

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a

Resistance 6KΩ in series

b

500Ω in series

c

It cannot be converted

d

6KΩ in parallel

answer is A.

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Detailed Solution

(R+G) ig=V⇒(R+G)=Vig

R+G=330×16×10−6=6.25kΩ=6250Ω

∴ Value of Question Image is 

R=6250-250=6000Ω

.This is connected in series in a voltmeter.

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