Q.

A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will be seen on the galvanometer G attached across the coil ?Three positions shown describe : (a) the magnet’s entry (b) magnet is completely inside and (c) magnet’s exit.

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a

b

c

d

answer is B.

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Detailed Solution

Rate of change of flux is maximum at entry and exit and also in the opposite direction.When in middle, there is no change in flux hence deflection should be zero.
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