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Using the Gauss' Law of Magnetism
We know total flux will be zero
flux(top)+flux(bottom)+flux(curved side)=0 ------- (a)
flux(bottom)= -25e-3 (GIVEN) (-ve shows inward direction)
flux(top)=B*A=(1.6e-3)*[3.14*(0.12)^2]=2.304e-5
Put the values in eq (a)
you'll get flux(curved side)= +24.97e-3 (+ve shows direction is outward)
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