PROBLEM 4: (10 points) A constant magnetic field is directed into the page in th

Question

PROBLEM 4: (10 points) A constant magnetic field is directed into the page in the shaded rectangular region. Since the field is zero outside the rectangular region, no flux passes through the ring in positions 1 nad 5, therefore there is no induced emf or current in the ring. Which of the following options correctly describes the induced current in the ring as it passes through positions 2, 3, and 4. (4 pts) a) I2 is clockwise, I3 is counterclockwise, I4 is counterclockwise. b) I2 is counterclockwise, Is is clockwise, I4 is clockwise. c) 12 is clockwise, 13 0, 14 is counterclockwise. d) 12 is counterclockwise, I3 0, I4 is clockwise. Position Explain your choice above, each one of the 3 positions (C6 Position 2 pts) Position 3 Position 4 Position f

Explanation / Answer

at I2, flux is increasing with field into the page.

hence induced current will counterclockwise as induced field will out of page.

at 3: flux is constant so i = 0

at 4: flux is decreasing so to compensate the decrement current will be clockwise.

Ans: (d)

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