A-LevelPhysicsMagnetic fields9702/43 · Oct/Nov 2018 · Q98 Marks

State Faraday's law of electromagnetic induction. ..[2]

(a)State Faraday's law of electromagnetic induction. ..[2][2]
(b)(i)Calculate the reading on the voltmeter connected to coil C during the time that the current is changing. reading = ................................................. V [2][2]
(b)(ii)Complete [Figure 9.2] for the voltmeter readings for the times before, during and after the direction of the current is reversed. before current changes during current change when current is zero after current changes reading on voltmeter connected to coil C/V reading on voltmeter connected to Hall probe/V 0.20 [Figure 9.2] [4][4]

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Mark scheme

Marking points from the official mark scheme (Oct/Nov 2018). The mark or mark type is shown in brackets.

[M1] (induced) e.m.f. proportional/equal to rate
[A1] of change of (magnetic) flux (linkage)
[C1] induced e.m.f. = (ΔB)AN/Δt
[C1] = (2 × 0.19 x 1.5 x 10⁻⁴ × 120)/0.13
[A1] = 0.053 V
[A1] reading on voltmeter connected to coil C/V: 0, 0.053, 0 (all three values required)
[B1] reading on voltmeter connected to Hall probe/V: zero in middle column
[B1] final column correct sign (negative)
[B1] final column correct magnitude (0.20)

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