A) both ammeter and voltmeter show constant reading
B) the reading of ammeter remains constant but that of voltmeter increases
C) the reading of ammeter remains constant but that of voltmeter decreases
D) both ammeter and voltmeter reading increases
Correct Answer: B
Solution :
: Due to shift of sliding contact from P to Q, reading of voltmeter increases but reading of ammeter remains constant. Potential gradient is set up along the wire PQ due to the cell. Along PQ, potential of P is greater than the potential of Q. The positive of the cell is connected to P.
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