Question 128 of 380

Two resistors are connected in series across a battery as shown in figure. If a voltmeter of resistance $2000\Omega$ is used to measure the potential difference across $500\Omega$ resister, the reading of the voltmeter will be _____ $V$

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Answer: 8

The voltmeter resistance is given to be $2000\Omega$. The equivalent resistance in the given circuit is ${R}_{eq}=\dfrac{500\times 2000}{2000+500}+600=1000\Omega$.
Now, current in the circuit is $i=\dfrac{20}{1000}A$.
Reading of the voltmeter will be, $V=20-600\times \dfrac{20}{1000}=8V$