P31_015 - 15. (a) Let L be the length of a side of the...

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15. (a) Let L be the length of a side of the square circuit. Then the magnetic flux through the circuit is Φ B = L 2 B/ 2, and the induced emf is E i = B dt = L 2 2 dB dt . Now B =0 . 042 0 . 870 t and dB/dt = 0 . 870 T / s. Thus, E i = (2 . 00 m) 2 2 (0 . 870 T / s) = 1 . 74 V . The magnetic Feld is out of the page and decreasing so the induced emf is counterclockwise around
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