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Q.

A voltmeter has resistance of 2000  Ω and it can measure upto 2V. If we want to increase its range to 10 V then the required resistance in series will be

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a

2000  Ω

b

4000  Ω

c

6000  Ω

d

8000  Ω

answer is D.

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Detailed Solution

Here,  n=102 =5∴    R=n−1G= 5−12000=8000  Ω
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