In the circuit shown, an inductor L is in series with bulb B, battery and switch K. When will bulb B suddenly become bright? [Image]
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In the circuit shown, an inductor L is in series with bulb B, battery and switch K. When will bulb B suddenly become bright? [Image]

G1 Physics · Accepted Answer

Step 1: A closing or opening switch changes current in the inductor. Step 2: At the instant of breaking contact, inductor current cannot fall to zero instantly because an induced emf opposes the reduction. Step 3: Energy stored in the inductor can briefly drive current through the bulb, producing a flash. Answer C (contact broken). Final answer: (C) When the contact is broken.