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Q.

A galvanometer having a coil resistance 100Ω gives a full scale deflection when a current of 1 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 10V?

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a

9.9 kΩ

b

7.9 kΩ

c

8.9 kΩ

d

10 kΩ

answer is A.

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Detailed Solution

V=igRg+R ⇒10=10−3100+R ⇒R= 9900 Ω =9.9 kΩ

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A galvanometer having a coil resistance 100Ω gives a full scale deflection when a current of 1 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 10V?