Hamza Rashid
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Report Thread starter 4 years ago
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When a current occurs in e.m.i, energy is transferred. The book says that this causes a reaction force due to the magnet hence the magnet must keep spinning.
Could someone please explain this to me?
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Call_me_bo
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(Do you remember the left hand rule for induction? That Current, B field and Force are mutually perpendicular? You need it for this question. Consider your thumb, index and middle finger as force, magnetic field, and current respectively.)
Basically: the current induces an emf And the magnet has a B-field around it. Therefore the Force pushing the magnet will make it spin to be perpendicular to these other components. (Emf/voltage is also produced here due to the cutting of flux lines)
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Hamza Rashid
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Oh! I forgot about the rule
Thank you
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