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Q.

Two short magnetic dipoles N→1=Mi^ and N2⇀=Mj^ are placed at the origin. Then magnetic induction at the point r,0 is

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a

μ04π3Mr3

b

μ04π2Mr3

c

μ04π5Mr3

d

μ04πNr3

answer is C.

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Detailed Solution

B→1=μ04π2Mr3i^B→2=−μ04πMr3j^∴ B=B12+B22=μ04π5Mr3
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Two short magnetic dipoles N→1=Mi^ and N2⇀=Mj^ are placed at the origin. Then magnetic induction at the point r,0 is