Physics (AS & A Level) · Oct / Nov 2023 · Paper 43 · Question 7

A varying current I passes through a resistor of resistance R in the circuit shown in Fig. 7.1. R I Fig. 7.1 Fig. 7.2 shows the variation with time t of I. I 0 0 I0 2I0 3I0 –I0 –2I0 –3I0 0.5 T 1.0 T 1.5 T 2.0 T t Fig. 7.2 The current has magnitude 2I0 when it is in the positive direction and I0 when it is in the negative direction. The period of the variation of the current is T.

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