Chapter 18
Electromagnetic Induction
Choose an area normal and a circuit reference, then identify what changes the magnetic flux linkage.
Spaced review
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Flux through a coil
Use perpendicular area and a chosen normal to distinguish signed flux from the total linkage of a coil.
Evidence for induction
Interpret controlled magnet-coil observations to infer induction, opposing direction and magnitude factors.
Linkage changes and induced direction
Use a signed linkage-time gradient, distinguish mean from instantaneous e.m.f. and apply Lenz's law to a stated change.
Alternating generation
Connect a rotating coil and complete slip-ring circuit to signed linkage, terminal voltage and mechanical input.
Magnetic braking and energy
Trace an entering loop's induced current and opposing force, then compare mechanical input with resistive heating.
Transformer voltage and current
Explain changing core flux and electrical isolation, apply ideal ratios and assess a separate real-loss account.