At a certain location there is a constant horizontal magnetic field pointing to

Question

At a certain location there is a constant horizontal magnetic field pointing to the east. A square loop of wire is placed in this field. At time A the bottom of the loop is resting on the floor (which is insulating), and the plane of the square loop is vertical and perpendicular to the magnetic field. The loop tips over and at time B it is flat on the floor. For this situation...

     A) The induced current is flows in one direction only
     B) Current is induced to flow in the loop because the magnetic field is changing
     C) While the loop is tipping over, the induced current is flowing northward through the bottom side of the square
     D) Before the loop starts to tip over, there is no induced current in the square loop
     E) The magnetic flux is greatest before the loop tips over

Explanation / Answer

When the plane of the loop was perpendicular to the magnetic field, maximum flux was passing through the loop and when it tips over and becomes flat on the floor, no flux is there through the loop.

During the interval from A to B, flux was decreasing through the loop or changing through the loop, so according to Lenz law, current was induced in the loop.

A) Yes, current induced flows only in one direction as magnetic flux was just decreasing.

B) Yes, magnetic flux or magnetic field through the loop was changing.

C) Yes, it is correct, according to Lenz law.

D) Yes, before the loop starts to tip over, no change in magnetic flux, hence no current is induced.

E) Yes, before the loop tips over, maximum magnetic flux through the loop was present.

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