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In Faraday's experiment, a current is induced in a secondary coil at the instant the primary's switch is
AHeld steady for a long time
BClosed only
COpened only
DBoth closed AND opened (any change in primary current induces emf)
Answer & Solution
Correct answer: D. Both closed AND opened (any change in primary current induces emf)
Induction occurs whenever the primary current — and hence the flux through the secondary — CHANGES. Steady DC current induces no emf in the secondary.
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