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Q.

A square frame, made of copper wire is carrying a current i=12 A. Length of side of the square is 1 m. If the frame is placed in a magnetic region where B1=1 μT and B2=2 μT, then net force experienced by the square frame is 

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a

18×10-6 N

b

12×10-6 N

c

24×10-6 N

d

36×10-6 N

answer is B.

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Detailed Solution

 Fnet =iB1+iB2=12×1×(1+2)×10-6 N=36×10-6 N

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