An electron moves on a straight line path 
as shown. The abcd is a coil adjacent to the path of electron. What will be the direction of current, if any, induced in the coil?
Text Solution
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The direction of current due to the motion of the electron will be 
. As the electron approaches the loop, the inward magnetic flux through the loop increases. Therefore, by Lenz's law, induced current will be in abcd. Similarly, the induced current will be in adcb as the electron moves away from the loop. Hence, the current will reverse its direction as the electron goes past the loop.
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