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(C) When key $K$ is pressed,the current through the electromagnet starts increasing. This leads to an increase in the magnetic flux linked with the co

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Jumps out of the core

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(C) When key $K$ is pressed,the current through the electromagnet starts increasing. This leads to an increase in the magnetic flux linked with the conducting ring. According to Lenz's Law,the induced current in the ring will flow in such a direction that it opposes the cause of its production,which is the increasing magnetic flux. This creates a magnetic pole on the face of the ring facing the electromagnet that is identical to the pole of the electromagnet,resulting in a repulsive force. Consequently,the ring experiences an upward force and jumps out of the core.

$A$ conducting ring is placed around the core of an electromagnet as shown in the figure. When key $K$ is pressed,the ring

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