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

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The voltmeter resistance is given to be $2000 Ω$ . The equivalent resistance in the given circuit is $R_{e q} = \frac{500 \times 2000}{2000 + 500} + 600 = 1000 Ω$ .

Now, current in the circuit is $i = \frac{20}{1000} A$ .

Reading of the voltmeter will be, $V = 20 - 600 \times \frac{20}{1000} = 8 V$

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