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For a short bar magnet, how does the axial field compare with the equatorial field at the same large distance?
AEqual in magnitude
BTwice as large
CHalf as large
DFour times as large
Answer & Solution
Correct answer: B. Twice as large
The axial field is mu0 2m over 4 pi r cubed while the equatorial field has magnitude mu0 m over 4 pi r cubed, so the ratio is two.
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