Answer :

Let’s consider the loop in two planes shown in above figure. Now look into plane ABCDA which is x-y plane so its area vector will be along z axis and for DEFAD plane, area vector will be along x axis, Assume ₁ & ₂ are the area vectors for above planes. So let’s find the area & therefore .

Given that also we know that flux is so putting B & A into flux equation



As we know that cross product of same unit vector is 1 and rest of all are zero because î,ĵ, k are all perpendicular to each other i.e.



Therefore, c is the correct answer.

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