A loop made of straight edegs has six corners at `A(0,0,0), B(L, O,0) C(L,L,0), D(0,L,0) E(0,L,L)` and `F(0,0,L)`. Where `L` is in meter. A magnetic field `B = B_(0)(hat(i) + hat(k))T` is present in the region. The flux passing through the loop `ABCDEFA` (in that order) is

Explanation

Loop ABCDA lie in x-y plane whose area vector `A_(1) = L^(2) overset(^)(k)` where ADEFA lie in y-z plane where are vector `A_2 = L^(2) overset(^)(i)`
`phi = B.A, A= A_(1) + A_(2) = (L^(2) overset(^)(k) + L^(2) overset(^)(i))`
`B = B_(0) ( overset(^) (i) + overset(^)(k) )( L^(2) k + L^(2) overset(^)(i) ) = 2 B_(0) L ^2 ` Wb.