Discussion
An AC current can be produced by
Answer: B
AC can be produced by a dynamo.
A dynamo, or electric generator, produces current by electromagnetic induction: a coil rotating in a magnetic field cuts magnetic lines of force, and the induced current reverses direction every half turn. With slip rings, it delivers alternating current (an AC generator).
A choke coil only limits AC current with little power loss, and a transformer only changes the voltage of an existing alternating current; neither produces AC from mechanical energy.
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