Question

A square of side x m lies in the x-y plane in a region, when the magntic field is given by `vecB=B_(0)(3hati+4hatj+5hatk)` T, where `B_(0)` is constant. The magnitude of flux passing through the square is
A. `5B_(0)x^(2)Wb`
B. `3B_(0)x^(3)Wb`
C. `2B_(0)x^(2)Wb`
D. `B_(0)x^(2)Wb`

Answer 1

Correct Answer - A
Here, `vecA=x^(2)hatkm^(2)and vecB=B_(0)(3hati+4hatj+5hatk)T`
AS `phi=vecB.vecA=B_(0)(3hati+4hatj+5hatk).x^(2)hatk`
`:.phi=5B_(0)x^(2)Wb`