A power supply of e.m.f. E and internal resistance 2-02 is connected as shown. The computer connected to the apparatus displays a graph of potential difference against time. The graph

shows the potential difference across the terminals of the power supply for a short time before and after switch S is closed. (a)State the e.m.f. of the power supply. (b) Calculate: (i) the reading on the ammeter after switch S is closed; (ii) the resistance of resistor R.

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