A empty cardboard box is placed in an electric field pointing upwards with a strength of 1200 N/C as shown above. The bottom of the box is tilted up by an angle Θ = 13° from the horizontal. Side A of the box faces out of the page and is 11 cm high and 16 cm long. Sides B and C are 11 cm high and 11 cm deep. Sides D and E are 16 cm long and 11 cm deep.
b) What is the flux through side B of the box?
Electric Flux = EAcos(theta)
The Attempt at a Solution
I do not know what angle to use for any of the sides. I tried 90-13 to get 77 but that doesnt work as well. Im not sure if I'm using the correct area as well. Im multiplying base x height but im not sure if that is the correct equation to use. Any help will be much appreciated, thanks in advance.