The graph shown is of the magnitude B vs time for a magnetic field that passes t

Question

The graph shown is of the magnitude B vs time for a magnetic field that passes through a fixed loop and is oriented perpendicular to the plane of the loop. Rank the magnitudes of the emf generated in the loop at the three instants indicated, from largest to smallest. a. a, b, c b. a, c, b c. b, c, a d. b, a, c e. c, a, b f. c, a, b A bar magnet is held above the center of a wire loop which lies in a horizontal plane. If the south end of the magnet is pointing toward the loop (i.e. pointing down) then which way is the current induced in the loop as the magnet falls. a. Up the wire b. Down the wire c. Towards the right through R d. Towards the left through R e. Clockwise f. Counterclockwise

Explanation / Answer

(1)

The magnitude of sloipe of magnetic field versus time graph is equal to the magnitude of the emf.

The slope is zero in the region a. so,the emf is zero.

The slope of the curve in the region b is more than that of the region c.

Therefore, the magnitude of the emf is largest in the region b.

The required ranking is b >c>a.

Therefore, the correct option is c.

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