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Question

# In the figure, AB is a long straight wire carrying a current of 20A and CDFG is a rectangular loop of size 20 cm x 9cm carrying a current of 10A. The edge CG is parallel to AB, at a distance of 1cm from it. The force exerted on the loop by the magnetic field of the wire is

A
3.6×104N attraction
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B
3.6×104N epulsion
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C
7.2×104N attraction
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D
7.2×104N repulsion
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Solution

## The correct option is C 7.2×10−4N attractionF=μ0i1i2l2π[1r1−1r2]=2×10−7×20×10×0.2[110−2−110×10−2]=8×10−6×[910]×102=7.2×10−4N

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