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JEE Main 2019 (12 Jan, Shift 2) · Capacitors in DC Circuits & RC

Capacitors in DC Circuits & RC question from JEE Main 2019 (12 Jan, Shift 2)

Q34JEE Main 2019 · 12 JAN · SHIFT 2Easy

Capacitors in DC Circuits & RC

The charge on a capacitor plate in a circuit, as a function of time, is shown in the figure:

What is the value of current at t = 4 s?

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Answer: (a)

Current is the slope of the $q$ – $t$ graph: $I = \dfrac{dq}{dt}$ .
Between $t = 2$ s and $t = 6$ s the charge stays constant at $3\ \mu\text{C}$ , so the slope is zero.
So the answer is (a) zero.

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