Consider a metal ring kept (supported by a cardboard) on top of a fixed solenoid carrying a current $I$ as per the figure. The centre of the ring coincides with the axis of the solenoid. If the current in the solenoid is switched off,what will happen to the ring?
(N/A) When the current in the solenoid is switched off,the magnetic flux linked with the metal ring decreases.
According to Lenz's Law,the induced current in the ring will flow in such a direction as to oppose this decrease in magnetic flux.
This means the ring will develop a magnetic polarity that attracts it towards the solenoid.
Therefore,the ring will remain on the cardboard and will not move away.
According to Lenz's Law,the induced current in the ring will flow in such a direction as to oppose this decrease in magnetic flux.
This means the ring will develop a magnetic polarity that attracts it towards the solenoid.
Therefore,the ring will remain on the cardboard and will not move away.
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Reason: The line integral $\oint \vec{E} \cdot d\vec{l}$ around the closed loop is nonzero.
Reason: The line integral $\oint \vec{E} \cdot d\vec{l}$ around the closed loop is nonzero.
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