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(C) When the key $K$ is pressed,the current in the solenoid increases from zero to a steady value. This change in current produces a changing magnetic

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Jumps out of the core

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(C) When the key $K$ is pressed,the current in the solenoid increases from zero to a steady value. This change in current produces a changing magnetic flux through the conducting ring. According to Faraday's law of electromagnetic induction,an induced electromotive force $(EMF)$ is produced in the ring,which drives an induced current. According to Lenz's law,the direction of this induced current is such that it opposes the cause that produced it. In this case,the increasing magnetic flux through the ring creates a magnetic pole on the face of the ring facing the solenoid,which is of the same polarity as the pole of the electromagnet. Since like poles repel each other,the ring experiences an upward repulsive 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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