Consider a uniform electric field `E=3xx10^(3) hat(i) N//C`. A square of 10 cm on a side whose plane is parallel to the yz plane.
What is the flux through the same square if the normal to its plane makes a `60^(@)` angle with the x-axis?

Explanation

Given `vec(E)=3xx10^(3) hat(i) N//C`
`vec(E)=3xx10^(3) hat(i) N//C, vec(S)=hat(i) m^(2), theta=60^(@)`
`phi=vec(E).vec(S)=ES cos 60^(@)=3xx10^(3) xx10^(-2)xx cos 60^(@)`
`:. phi =15 N-m^(2)`/C