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Capacitor question

2025 · 23 Jan · Shift 1 · Q69
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  5. /2025 · 23 Jan · Shift 1 · Q69

Capacitor question

2025 · 23 Jan · Shift 1 · Q69

JEE MainPhysicsCapacitorMCQ+4 / −1
Identify the valid statements relevant to the given circuit at the instant when the key is closed. JEE Main 2025 (Online) 23rd January Morning Shift Physics - Capacitor Question 10 English A. There will be no current through resistor RRR. 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:
  1. A
    A, C Only
  2. B
    C, D Only
  3. C
    A, B, D Only
  4. D
    B, C, D Only
View written solutionFree

Correct answer: D

  1. Key idea at the instant the key is closed

    For an initially uncharged capacitor, at the moment just after closing the key, the capacitor behaves like a short circuit.

    That means:

    • voltage across capacitor is initially zero,
    • current in the circuit is initially maximum.
  2. Check each statement

    Statement A: There will be no current through resistor RRR.

    This is false.

    At t=0+t=0^+t=0+, since the capacitor behaves like a wire, the circuit current is maximum, and hence current does pass through the resistor in the charging circuit.

    Statement B: There will be maximum current in the connecting wires.

    This is true.

    Initially, capacitor offers zero opposition to change in charge, so the charging current is maximum: I(0)=VRI(0)=\frac{V}{R}I(0)=RV​ (for a simple RC circuit).

    Statement C: Potential difference between the capacitor plates A and B is minimum.

    This is true.

    Initially the capacitor is uncharged, so VC(0)=0V_C(0)=0VC​(0)=0 which is the minimum possible value.

    Statement D: Charge on the capacitor plates is minimum.

    This is true.

    Initially, Q(0)=CVC(0)=0Q(0)=CV_C(0)=0Q(0)=CVC​(0)=0 so the charge is minimum.

  3. Correct set of statements

    True statements are: B, C, DB,\ C,\ DB, C, D

  4. Match with options

    • A: A,CA, CA,C only → incorrect
    • B: C,DC, DC,D only → incorrect
    • C: A,B,DA, B, DA,B,D only → incorrect
    • D: B,C,DB, C, DB,C,D only → correct

Therefore, the correct option is D.

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