A short bar magnet produces magnetic fields of equal induction at two points; one on the axial line and the other on the equatorial line. What is the ratio of their distances?
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a
1:213
b
213:1
c
1:212
d
212:1
answer is B.
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Detailed Solution
Given Baxial=Bequatorial ⇒μ04π2Md 13=μ04πMd23 ⇒d1d23=21 ⇒d1d2=2131