In the following figure, a metallic ring is shown to fall vertically on a bar magnet. The induced current in the ring will be:
Correct answer: B. Clockwise
- A. Zero
- B. Clockwise
- C. Counter clockwise
- D. Along the direction of the fall
Explanation
As the metallic ring falls towards the bar magnet, it experiences a change in magnetic flux, which induces a current in the ring. According to Lenz's law, the direction of the induced current will be such that it opposes the change in flux. This means the induced current will create its own magnetic field to counteract the increase in magnetic field from the bar magnet as the ring approaches it. By applying the right-hand rule, we determine that this induced current will flow in a clockwise direction when viewed from above. The other options are incorrect because they either do not account for the change in magnetic flux or incorrectly determine the direction of the induced current.
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About Electromagnetic Induction
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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