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Question
A conducting ring is placed around the core of an electromagnet as shown in fig. When key K is pressed, the ring: (Consider the ring is light weight)
A conducting ring is placed around the core of an electromagnet as shown in fig. When key K is pressed, the ring: (Consider the ring is light weight)
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Solution
The correct option is C Jumps out of the core.
When the key K is pressed, current flows through the electromagnet and flux linked with the ring changes. The induced emf in the ring is equal to the rate of change of magnetic flux linked with the ring. Lenz's law states that, induced current appears in such a direction that it opposes the change in the flux in the ring.
From FBD, the forces acting on the ring - Weight in downwards direction.
- Magnetic force in the upwards direction.
If the magnetic force is greater than the weight the ring will jump out of the coil.
When the key K is pressed, current flows through the electromagnet and flux linked with the ring changes. The induced emf in the ring is equal to the rate of change of magnetic flux linked with the ring. Lenz's law states that, induced current appears in such a direction that it opposes the change in the flux in the ring.
From FBD, the forces acting on the ring
- Weight in downwards direction.
- Magnetic force in the upwards direction.
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