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Consider a metal ring kept on top of a fixed solenoid (say on a cardboard) as shown in Fig. 6.28. The centre of the ring coincides with the axis of the solenoid. If the current is suddenly switched on, the metal ring jumps up. Explain. |
Answer» Solution :Initially there was no current and so no MAGNETIC flux was passing through the metal ring. When current is PASSED on, a magnetic field is produced and magnetic flux passes through the ring. In accordance with Faraday.s law due to increase in magnetic flux of ring induced current is SET up in metal ring. As per Lenz.s law the induced current TENDS to oppose the increase in magnetic flux passing through the ring. It is possible only if the ring moves away from the SOLENOID. So the metal ring jumps up. 
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