Question

A 2.0 cm x 3.0 cm rectangle lies in the xy-plane. What is the electric flux if E= (100 i + 50 k) N/C?

Answer 1

So confused. Like area is in the xy plane and flux in the xz plane? So how am I supposed to find flux if they aren't in the same plane?

Answer 2

@IrishBoy123

Answer 3

dot product

\(\Phi = \vec E * \vec A = \vec E * <0,0,1>A\)

Answer 4

so you're projecting your field onto the x-y plavne which has unit normal vector \(\hat n = <0,0,1>\)

Answer 5

Why are we using the normal vector?

Answer 6

you want the flux passing through the surface.



split the firld into gree horizontal and vertical bits

you are only interested in the vertical bits