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A single loop of wire in the shape of a square with sides of length l=25.0...

A single loop of wire in the shape of a square with sides of length l=25.0 cm is sitting in a uniform magnetic field of 1.30 T. The field points out of the page, and the the loop is in the plane of the page with sides parallel to the x and y axes.

(a) If a current of 3.70 A flows through the loop, what is the magnitude of the magnetic force on a single side of the loop?

(b) If the magnetic field strength drops to zero in 2.40 s, what is the magnitude of the emf that will be induced in the loop? (Disregard the original current flow in this part and the next part).

(c) What direction (clockwise or counter clockwise) would the current flow due to the emf from part (b)?

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Answer #1

The induced current as a result of induced emf is in such a direction that it always opposes the change in external magnetic field. So there will be a increasing induced magnetic field in direction of out of the page to counter the DECREASING external magnetic field.

And it is only possible when induced current flows in COUNTERCLOCKWISE direction

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