First slide

Electrical power

Question

Charge flowing through a 10Ω resistor varies with time as shown in the figure. Then power dissipated in the resistor is zero at the instant t =

Moderate

A

Zero
B

4
C

2
D

3

Solution

Power dissipated P = $i^{2} R$
Now $i = \frac{dQ}{dt} = slope$ of Q-t graph.
From the diagram, i is zero at t = 2s.
Hence option (3) is correct.

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