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In the series Rc circuit shown in the figure, the voltage across C starts increasing when the d.c. source is switched on. The rate of increase of voltage across C at the instant just after the switch is closed (i.e. at t = 0+) will be
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- zero
- infinity
- RC
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1 RC
Correct Option: D
Voltage across the capacitor at any time t, Vc = V (l – e– t / RC)
= l – e– t / RC ... (since V = 1 volt)
| ∴ | = | e– t / RC | ||
| dt | RC |
| At t = 0+ , | = | |||
| dt | RC |
