JEE MAIN - Physics (2025 - 23rd January Morning Shift - No. 19)
Identify the valid statements relevant to the given circuit at the instant when the key is closed.
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A. There will be no current through resistor $R$.
B. There will be maximum current in the connecting wires.
C. Potential difference between the capacitor plates A and B is minimum.
D. Charge on the capacitor plates is minimum.
Choose the correct answer from the options given below:
Explanation
Initially, when the key in the circuit is closed, the capacitor behaves like a short circuit. This means:
Maximum Current: The current flowing through the circuit will be at its maximum since there is effectively no resistance offered by the capacitor, as it behaves like a wire.
Current Through R: Since the current is flowing through the circuit, including any resistors in series, the statement that there is no current through resistor $ R $ is incorrect.
Charge on the Capacitor: The charge stored on the capacitor plates is initially zero because it behaves as a short circuit.
Potential Difference: The potential difference across the capacitor is also zero at this instant because it is fully discharged.
Therefore, the valid statements at this instant are that the current in the circuit is at a maximum, the charge on the capacitor is zero, and the potential difference across the capacitor is zero.
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