Question

A circuit element is placed in a closed box. A time t = 0, a constant current generator supplying a current of I amp is connected across the box. Potential difference. across the box varies according to graph as shown in the figure. The element in the box is –

• A. A resistance of 2W
• B. A battery of emf 6V
• C. An inductance of 2H
• D. A capacitance

Answer 1

Answer: (D)

A capacitance

Answer 2

I = $\frac{dq}{dt}$ ̃ q = It + a

V = $\frac{q}{c}$ = $\frac{It + a}{c}$

\ V is proportional to time.