A bar magnet M is dropped so that if falls vertically through the coil C. The graph obtained for voltage produced acorss the coil vs time is shown in Fig.
(i) Explain the shape of the graph
(ii) Why is the negative peak longer than the positive peak?
A bar magnet M is dropped so that if falls vertically through the coil C. The graph obtained for voltage produced acorss the coil vs time is shown in Fig.
(i) Explain the shape of the graph
(ii) Why is the negative peak longer than the positive peak?
(i) Explain the shape of the graph
(ii) Why is the negative peak longer than the positive peak?
Text Solution
Verified by Experts
As the magnet M approaches coil C, magnetic flux linked with the coil increases. `emf//current` is induced in the coil, which opposes the increase in flux. When magnet in inside the coil, magnetic flux linked with the coil is constant. Induced `emf//current` is zero. As the magnet falls below the coil, mag. flux linked with the coil decreases. `emf//current` is induced in the coil, which opposes the decrease in flux. As velocity of magent has increased, induced `emf//current` is more. Therefore, nagative peak is longer than the positive peak. When the magnet has fallen through large distance, changing mag. flux due to its movement vanishes. Induced emf reduces to zero.
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