In the circuit shown in the figure, the reading of the voltmeter V will be
A
4V
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B
2V
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C
6V
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D
3V
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Solution
The correct option is A4V The voltmeter measures the potential difference across 100Ω resistor. Let i be the current through the circuit. i=12100+200=0.04A
Potential difference across 100Ω resistor, ΔV=iR=0.04×100=4V
Note: In an ideal voltmeter, the resistance is infinite, here, iV=0.