Physics · May / June 2023 · Paper 41 · Question 8
0625
As printed in the paper
The question as text
The electricity supplied to a town is transmitted using a high-voltage cable. A transformer in the town has a soft-iron core.
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8(a)[4]
any four from:
alternating current in (primary coil)
(current in primary generates) changing magnetic field
iron core concentrates (magnetic) field OR iron core transfers (magnetic) field (to secondary coil)
secondary coil is in alternating / changing (magnetic) field OR secondary coil cuts (magnetic) field
e.m.f. induced (in secondary coil)
8(b)(i)[2]
(number of turns =) 3000
Np/ Ns = Vp/ Vs OR (Np =) Ns Vp/ Vs OR (Np =) 450 × 220 000 / 33 000
8(b)(ii)[3]
(current =) 350 A
P = IV OR (I =) P / V OR (I =) 7.7 × 107 / 220 000
(I =) 3.5 × 10N
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