A-LevelPhysicsD.C. circuits9702/12 · May/June 2013 · Q361 Mark
A 12V battery is in series with an ammeter, a 2Ω fixed resistor and a 0-10Ω variable resistor. High-resistance voltmeters P and Q are connected across the variable resistor and the fixed resistor respectively, as shown. [Figure showing a circuit with a battery, ammeter, fixed resistor, variable resistor, and voltmeters P and Q] The resistance of the variable resistor is changed from its maximum value to zero. Which graph shows the variation with current of the voltmeter readings?
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AGraph with line P (voltmeter reading across variable resistor) decreasing linearly with current, and line Q (voltmeter reading across fixed resistor) increasing linearly with current.
BGraph with line P decreasing linearly with current, and line Q decreasing linearly with current.
CGraph with line P increasing linearly with current, and line Q decreasing linearly with current.
DGraph with line P decreasing linearly with current (from maximum), and line Q increasing linearly with current (from minimum).
✓ Correct answer
D: Graph with line P decreasing linearly with current (from maximum), and line Q increasing linearly with current (from minimum).
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