Determine the direction of the induced emf of the following loops at the following instant
Homework Answers
(a) Clockwise
The loop is moving out of the field B region. So B is decreasing. Thus by Lenz's law the induced current should be such that it increases the field B.
Original B is into the page, so the direction of the induced current should be such that the field due to it is also into the page.
Therefore the direction is clockwise.
(b) Counter-clockwise
Here the magnet is moving away from the loop. So by lenz law the induced current should be such that it attracts the magnet towards it.
For that it should induce a N pole so as to attract the S pole near it.
North N pole is induced by ccw current thus the direction of current is ccw.
[Direction of induced current and emf is same]
(c) No induced current as there is no B field.
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Determine the direction of the induced emf of the following loops
at the following instant
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