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Q.

Two short magnets of magnetic moment 1000 Am2 are placed as shown at the corner of a square of side 10 cm the net magnetic induction at ‘P’ is

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a

0.1 T

b

0.2 T

c

0.3 T

d

0.4 T

answer is A.

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Detailed Solution

As equatorial point, B1=μ04πMd3=10−7×10000.13=10−7×100010−3=10−1=0.1TAs axial point, B2=μ04π2Md3=10−7210000.13=0.2 TNet field,  B=B2−B1=0.1T
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Two short magnets of magnetic moment 1000 Am2 are placed as shown at the corner of a square of side 10 cm the net magnetic induction at ‘P’ is