Physics (AS & A Level) · May / June 2025 · Paper 53 · Question 2
9702
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A student investigates an electrical circuit. The circuit is set up as shown in Fig. 2.1. Q Z P A Fig. 2.1 A battery of negligible internal resistance is connected to a resistor of resistance Z. Five resistors, each of resistance R, are connected in parallel between P and Q. The switch is closed. The total current I in the circuit is measured using the ammeter. The experiment is then repeated by changing the number n of resistors, each of resistance R, connected in parallel between P and Q. It is suggested that I and n are related by the equation E = I ( R n + Z) where E is the electromotive force (e.m.f.) of the battery. 1 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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