Identify the valid statements relevant to the given circuit at the instant when the key is closed.
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:
Answer: (D) B, C, D only
At the instant the key is closed the capacitor is uncharged, so:
- its charge is zero (minimum): D correct;
- the potential difference across it is zero (minimum): C correct;
- the whole emf appears across $R$, so the current $I = \dfrac{5}{R}$ is at its maximum: B correct and A wrong.
As the capacitor charges, the current falls towards zero.
B, C, D only.
Solution by Sreeraj P, M.Sc Physics