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B
0.8×10−5, attraction
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C
0.4×10−5, attraction
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D
0.4×10−5, repulsion
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Solution
The correct option is B0.8×10−5, attraction
Force on the loop ABCD: FAB=2×10−7×305×10−2×10×10−2N =1.2×10−5N FCD=2×10−7×3015×10−2×10×10−2 =0.4×10−5 Fnet=1.2×10−5−0.4×10−5 =0.8×10−5N