ch32-p047 - 47. (a) The field of a dipole along its axis is...

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47. (a) The field of a dipole along its axis is given by Eq. 30-29: B z = µ 0 3 2 π , where is the dipole moment and z is the distance from the dipole. Thus, B A = ×⋅ × × −− 41 0 1 5 1 0 2 30 10 72 3 6 π π10 10 −9 Tm JT m T. ch c h c h . . (b) The energy of a magnetic dipole G in a magnetic field G B is given by UB B =− ⋅ =− G G µµ φ cos , where is the angle between the dipole moment and the field. The energy required to turn it end-for-end (from = 0° to = 180°) is
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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