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Q.

Find the magnitude of magnetic moment of the current carrying loop ABCDEFA. Each side of the loop is 10cm long and current in the loop is  i=2.0A

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a

0.028 Am2

b

2.8 Am2

c

3.8 Am2

d

0.038 Am2

answer is A.

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Detailed Solution

By assuming the equal and opposite currents in BE, two current carrying loops  (ABEFA and BCDEB) are formed.Their magnetic moments are equal in Magnitude but perpendicular  to each other. Mnet=M2+M2=2Mhere , M=IA=2.00.10.1=0.02⇒Mnet=1.4140.02=0.028 Am2 Their magnetic moments are equal in Magnitude but perpendicular  to each other.
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