Physics (AS & A Level) · May / June 2021 · Paper 52 · Question 2
9702
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A student investigates the current in a circuit containing a cell, as shown in Fig. 2.1. A R1 P r E R2 Q Fig. 2.1 The student connects two resistors of resistances R1 and R2 between P and Q. The ammeter measures the current I. The student repeats the experiment with different resistors between P and Q. It is suggested that I, R1 and R2 are related by the equation E = I(R1 + R2 + r) where E is the electromotive force (e.m.f.) and r is the internal resistance of the cell. 1
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2(a)[1]
2(b)[2]
2(c)(i)[2]
2(c)(ii)[2]
2(c)(iii)[2]
2(c)(iv)[2]
2(d)(i)[2]
2(d)(ii)[1]
2(e)[1]
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