A rectangular loop is pulled into a region where there is a uniform magnetic fie

Question

A rectangular loop is pulled into a region where there is a uniform magnetic field pointing into the page. You may assume that the field created inside a rectangular loop obeys the same right- hand rule as the circle. Use Lenz's law to predict and explain the direction of the induced current in the loop while it is entering the magnetic field. Use the motional emf argument to predict and explain the direction of the induced current in the loop while it is entering the magnetic field. Use Lenz's law to predict and explain the direction of the induced current in the loop after it has completely entered the magnetic field. Use the motional emf argument to predict and explain the direction of the induced current in the loop after it has has completely entered the magnetic field.

Explanation / Answer

a) In this case, the rectangular loop is moving inwards towards the magnetic field and thus, increasing the magnetic flux through it. So to oppose it the induce current should act to counter this increase, i.e. anti-clockwise.

b) same as above.

c) as the loop is completely inside the field, there is no net increase in the magnetic flux and thus the induced emf is constant.

d) same as c)

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