Physics · May / June 2020 · Paper 42 · Question 7
0625
As printed in the paper
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7(a)(i)[3]
primary coil wound round iron AND (labelled primary or coil OR connected to labelled supply / 12 V)
secondary coil wound round iron AND (labelled secondary OR connected to labelled output / 2 V)
significantly more coils around primary
7(a)(ii)[2]
two from three
links magnetic fields of coils / primary and secondarystronger magnetic field in secondarybetter induction owtte7(a)(iii)[2]
V1I1 = V2I2 in any form OR (I1 =) V2I2 / V1
OR (I1 =) 2 × 0.10 / 12
(I1 =) 0.017 A
7(b)[2]
metal case earthed
in case wire falls off / insulation fails / live(wire) touches case
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