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← Topic 20 overviewTOPIC 20 ASSESSMENT

Magnetic fields

CIE-style questions assess magnetic forces, charged-particle paths, current fields and electromagnetic induction.

Objective question 1

Force on a current-carrying conductor is maximum when current is:

Objective question 2

A magnetic field acting alone on a charged particle does work of:

Objective question 3

For perpendicular entry, charged-particle path radius is:

Objective question 4

Parallel currents in the same direction:

Objective question 5

Lenz's law determines the induced:

Structured question 1

Calculate force on 0.20 m of wire carrying 3.0 A perpendicular to a 0.40 T field.

Structured question 2

A velocity selector has E = 2.4 × 10⁴ V m⁻¹ and B = 0.080 T. Calculate selected speed.

Structured question 3

Flux linkage changes by 0.12 Wb-turn in 0.030 s. Calculate induced emf magnitude.