5 An RC circuit is connected across an ideal DC voltage source through an open s

Question

5

An RC circuit is connected across an ideal DC voltage source through an open switch. The switch is closed at time t = 0 s. Which of the following statements regarding the circuit are correct? Why (a) The potential differences across the resistor and the capacitor are always equal. (b) The potential difference across the resistor is always greater than across the capacitor. (c) The potential difference across the capacitor is always greater than the across the resistor. (d) Once the capacitor is essentially fully charged, there is no appreciable current in the circuit. (e) The capacitor charges to - 63% of its maximum value in one time constant and the current is zero at that time.

Explanation / Answer

a) False.

because, As the time passes potential diffrence across resistor decreases and potential difference across capacitor increases.

b) Flase

c) Flase

d) True.

In this case, there is no potantial drop across resistor.

so, V = I*R

==> I = V/R

= 0/R

= 0

e) False.

In this case current will not be zero.

Current also becomes 63% of maximum current.

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