Explanation
The induced current will be in such a direction so that it opposes the change due to which it is produced.
E.m.f is induced in the ring and it opposes the motion. Hence due to the resistance of the ring all energy dissipates.
Faraday’s laws involve conversion of mechanical energy into electrical energy. This is in accordance with the law of conservation of energy.
If bar magnet is falling vertically through the hollow region of long vertical copper tube then the magnetic flux linked with the copper tube (due to ‘non-uniform’ magnetic field of magnet) changes and eddy currents are generated in the body of the tube by Lenz’s law. The eddy currents oppose the falling of the magnet which therefore experiences a retarding force. The retarding force increases with increasing velocity of the magnet and finally equals the weight of the magnet. The magnet then attains a constant final terminal velocity I. e., magnet ultimately falls with zero acceleration in the tube.
At low frequency of 1 to 2 Hz, oscillations may be observed as our eyes will be able to detect it.
Since the magnetic field is uniform therefore there will be no change in flux hence no current will be induced.
Eddy currents are set up when a plate swings in a magnetic field. This opposes the motion.
According to Fleming’s right hand rule, the direction of B will be perpendicular to the plane of paper and act downward.
By Fleming's right hand rule.
Two circular loops carrying current in the same direction will attract each other. If they are now separated, then current will increase in both in accordance with Lenz’s law.
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