CAIE A-Level Physics A2 19.3.1 The Variation with Time of Potential Difference Charge and Current Topic Practice

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Question 1

[Maximum number: 3]

Fig. 6.1 shows a capacitor of capacitance C connected in series with a resistor of resistance R.

Fig. 6.1

Fig. 6.1

Initially the switch is open and there is a p.d. of 12 V across the capacitor.
At time t=0, the switch is closed so that there is a current I in the resistor.
Fig. 6.2 shows the variation of I with t.

Fig. 6.2

Fig. 6.2

Explain the shape of the line in Fig. 6.2.

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