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Q.

A voltmeter has an internal resistance of 1000 $Ω$ and gives full scale deflection when 2 V is applied across the terminals. Now a resistance of 4000 $Ω$ is connected in series with it. Then it gives full scale deflection with

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a

6 V

b

10 V

c

4 V

d

8 V

answer is B.

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Detailed Solution

$R = G (\frac{V}{V_{g}} - 1); 4000 = 1000 (\frac{V}{2} - 1) \Rightarrow V = 10 V$

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A voltmeter has an internal resistance of 1000 Ω and gives full scale deflection when 2 V is applied across the terminals. Now a resistance of 4000 Ω is connected in series with it. Then it gives full scale deflection with