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Q.

A galvanometer having coil resistance 100 Ω gives a full scale deflection when a current of 10 mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of 10 V  ?

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a

900Ω

b

9.9 KΩ

c

8.9 KΩ

d

999 KΩ

answer is A.

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Detailed Solution

Vg = igRg=10×10−3×100=1V V=10V R=RgVVg - 1=100×101−1=100×9=900ΩAlternate method:R=Vig-G=1010×10−3-100=1000-100=900Ω
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