P31_066 - 66(a The magnitude of the magnetic field at the...

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Unformatted text preview: 66. (a) The magnitude of the magnetic field at the center of the loop, using Eq. 30-11, is B= 4π × 10−7 H/m (100 A) µ0 i = = 1.3 × 10−3 T . 2R 2(50 × 10−3 m) (b) The energy per unit volume in the immediate vicinity of the center of the loop is uB = B2 (1.3 × 10−3 T)2 3 = 0.63 J/m . = 2 µ0 2 (4π × 10−7 H/m) ...
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