P30_056 - 56. (a) By the right-hand rule, B points into the...

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Unformatted text preview: 56. (a) By the right-hand rule, B points into the paper at P (see Fig. 30-6(c)). To find the magnitude of the field, we use Eq. 30-11 for each semicircle (φ = π rad), and use superposition to obtain the result: µ0 iπ µ0 iπ µ0 i 1 1 B= + = + . 4πa 4πb 4 ab (b) The direction of µ is the same as the B found in part (a): into the paper. The enclosed area is A = (πa2 + πb2 )/2 which means the magnetic dipole moment has magnitude |µ| = πi 2 a + b2 2 . ...
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