O-LevelPhysicsElectricity5054/12 · Oct/Nov 2025 · Q341 Mark
A resistor of resistance R is connected to a variable resistor, a voltmeter and a power supply of electromotive force (e.m.f.) E. [Figure 34.1] The resistance of the variable resistor increases from 0 to 2R. What happens to the reading on the voltmeter?
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AIt increases from 0 to 1/4 E.
BIt increases from 0 to 1/2 E.
CIt increases from 0 to 2/3 E.
DIt increases from 0 to E.
✓ Correct answer
C: It increases from 0 to 2/3 E.
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