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Question

A varying voltage is applied between the terminals A,B so that the voltage across the capacitor varies as shown in the figure. Then


A
The voltage between the terminals CD is constant between 2t0 and 3t0
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B
The current in the resistor is 0 between 2t0 and 3t0
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C
The average current in the resistor between t0 and 5t0 is zero
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D
The current in the resistor between t0 and 2t0 is twice the current between 3t0 and 5t0
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Solution

The correct options are
B The current in the resistor is 0 between 2t0 and 3t0
C The average current in the resistor between t0 and 5t0 is zero
D The current in the resistor between t0 and 2t0 is twice the current between 3t0 and 5t0
When the capacitor voltage is constant, its charge is constant. Hence, no current flows in the resistor. Also dqdt is double between t0 and 2t0 compared to 3t0 and 5t0 since the slope of V-t is double.

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