Physics
A bar magnet is rotated near a coil as shown below
Which of the following statement is correct for given situation?
- Induced current flows in only one direction.
- Strength of induced emf increases as the rotation speed is decreased
- The strength of induced emf is affected due to coil resistance.
- The direction of induced current changes alternatively.
Electro-Magnetism
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Answer
The direction of induced current changes alternatively.
Reason — Due to rotation the magnetic polarity of coil keeps on changing. Hence, the direction of induced current changes alternatively. Strength of induced emf decreases as the rotation speed is decreased and the resistance of coil does not affect the strength of induced emf.
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