A-LevelPhysicsD.C. circuits9702/12 · May/June 2017 · Q371 Mark
A circuit is set up as shown. [Figure shows a circuit with a cell, an ammeter (A), and two voltmeters (P and Q) across different parts of a series circuit including a variable resistor.] The variable resistor is adjusted so that the ammeter reading decreases. How do the readings of the voltmeters change? [Table with columns: reading on voltmeter P, reading on voltmeter Q. Rows for A, B, C, D show different changes (decreases/increases).]
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Areading on voltmeter P: decreases, reading on voltmeter Q: decreases
Breading on voltmeter P: decreases, reading on voltmeter Q: increases
Creading on voltmeter P: increases, reading on voltmeter Q: decreases
Dreading on voltmeter P: increases, reading on voltmeter Q: increases
✓ Correct answer
B: reading on voltmeter P: decreases, reading on voltmeter Q: increases
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