Physics
Grade-10
Easy
Question
A magnet and a coil are taken. In which of the following cases, emf is not induced in the coil?
- Magnet is moving, the coil is at rest.
- Magnet is at rest and the coil is moving
- Both magnet and coil are moving with equal velocities in the same direction.
- Magnet is moving with greater velocity than that of coil
Hint:
Induced emf directly depends on relative motion between the magnet and coil, but if there is no relative motion between them, there will be no induced emf.
The correct answer is: Both magnet and coil are moving with equal velocities in the same direction.
The electromagnetic field is not created when both magnet and coil are moving with equal velocities in the same direction.
- The electromagnetic field is created when a coil gets in contact with the magnet.
- An electromagnetic field is induced when the coil or magnet is moving towards one another.
- When the coil and the magnet move in the same direction at the same velocity, they won't get in contact with electromagnetic induction.
- Thus, the electromagnetic field is not created when the coil and the magnet are moving in the same direction with the same velocity.
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