A flat sheet is in the shape of a rectangle with sides of lengths 0.400 m and 0.600 m. The sheet is immersed in a uniform electric field of magnitude 95.0 N/C that is directed at 20∘ from the plane of the sheet. Required:
Find the magnitude of the electric flux through the sheet.

ФE = 9.403W

Explanation:

In order to calculate the magnitude of the electric flux trough the sheet, you use the following formula:

      (1)

A: area of the rectangular sheet = (0.400m)(0.600m) = 0.24m^2

E: magnitude of the electric field = 95.0N/C

θ: angle between the direction of the electric field and the normal to the surface of the sheet

You replace the values of the parameters in the equation (1):

The magnitude of the electric flux is trough the sheet is 9.403W

no. dot product   =0 when vecs at right angles