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

Moving Charges and Magnetism

Solution:

$ \frac{V_1}{V_2}=\frac{R_1}{R_2}=\frac{2}{V_2}=\frac{1000}{1000+4000} $
Since $Req = R _1+ R _2$
$ V _2=10 V $