Physics · Oct / Nov 2023 · Paper 41 · Question 8
0625
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A cylinder is made of modelling clay. The modelling clay is an electrical conductor. Fig. 8.1 shows the cylinder. length cross-sectional area Fig. 8.1 The cylinder is connected into a circuit. Fig. 8.2 shows that the circuit also includes a battery of electromotive force (e.m.f.) 9.0 V and a resistor P. P 9.0 V cylinder of modelling clay Fig. 8.2 The resistance of P is 4.0 Ω. The current in P is 1.5 A.
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8(a)(i)[2]
900 C
I = Q / t OR (Q =) It OR 1.5 × 600
8(a)(ii)[3]
2.0 Ω
R = V / I OR (Rtot =) V / I OR 9.(0) / 1.5 or 6.(0)
(Rcyl =) total resistance – P OR (Rcyl =) 6.0 – 4.0
8(b)[4]
1200 s
R is directly proportional to l OR (new cylinder) twice as long means twice R
R is inversely proportional to A OR (new cylinder) half cross-sectional area means twice R
(resistance of cylinder =) 4 × (a)(ii) (Ω)
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