Electromagnetic Induction
Definitions: Electromagnetic Induction
Exam question
Define magnetic flux.
9702/42 · May/Jun 2023 · Q6(a)(i)
Model answer
The product of magnetic flux density and area, where the area is perpendicular to the field.
Exam question
Define magnetic flux linkage.
9702/42 · Feb/Mar 2021 · Q9(a)
Model answer
The product of magnetic flux density, area and number of turns, where the area is perpendicular to the field and the same flux passes through each turn.
Exam question
State Faraday’s law of electromagnetic induction.
9702/41 · Oct/Nov 2025 · Q7(a)
Model answer
The induced e.m.f. is directly proportional to the rate of change of magnetic flux linkage.
Exam question
State Lenz’s law of electromagnetic induction.
9702/42 · Oct/Nov 2022 · Q8(a)
Model answer
The direction of the induced e.m.f. is such that its effects oppose the change that caused it.