Q.

The magnetic moment of a short magnet is 8 amp-m2. What is the magnetic induction at a point 20 cm away on its equatorial line from its mid-point ?

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a

10-4 web/m2

b

2 x 10-4 web/m2

c

3 x 10-4 web/m2

d

4 x 10-4 web/m2

answer is A.

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Detailed Solution

B=μ04π×Md3 ∴B=10−7×820×10−23=10−4 web /m2
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The magnetic moment of a short magnet is 8 amp-m2. What is the magnetic induction at a point 20 cm away on its equatorial line from its mid-point ?