Physics · Oct / Nov 2020 · Paper 62 · Question 3
0625
As printed in the paper
The question as text
A student is investigating the resistance of samples of wire. Fig. 3.1 shows the circuit used. V A B E power supply resistance wire C D Fig. 3.1 Table 3.1 shows how the samples of wire are connected into the circuit. Table 3.1 section wire BC one 30 cm piece CD two 30 cm pieces DE three 30 cm pieces
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Show the answer and mark scheme
3(a)(i)[1]
V1 = 1.4(0) (V)
3(a)(ii)[1]
I = 0.56 (A)
3(a)(iii)[1]
R1 = 2.5(0) (Ω)
3(b)[1]
R3 = 0.82 (Ω)
3(c)[1]
V, Ω, V
3(d)(i)[1]
second box ticked
3(d)(ii)[1]
correct justification using results
3(e)[2]
use different lengths (of the wire sample)
measure the p.d. and current / determine the resistance (of each length)
3(f)(i)[1]
variable resistor / resistance / rheostat
3(f)(ii)[1]
correct circuit symbol for a variable resistor
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