P31_082 - 82. We note that n = 100 turns/cm = 10000...

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82. We note that n = 100 turns / cm = 10000 turns / m . The induced emf is E = d Φ B dt = d ( BA ) dt = A d dt ( µ 0 ni )= µ 0 nπr 2 di dt = (4 π × 10 7 T · m / A)(10000 turn / m)( π )(25 × 10 3 m) 2 µ 0 . 50 A 1 . 0A 10 × 10 3 s =1 . 2 × 10 3 V . Note that since
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