JEE MAIN - Physics (2022 - 29th June Evening Shift - No. 22)
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 $$\Omega$$ resistor, the reading of the voltmeter will be ___________ V.
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Answer
8
Explanation
New $${R_{eff}} = {{2000 \times 500} \over {2500}} + 600\,\Omega = 1000\,\Omega $$
$$\Rightarrow$$ Reading of voltmeter $$ = {{400} \over {1000}} \times 20 = 8$$ volts
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