1. The problem statement, all variables and given/known data Hello, A 3.60cm x 4.50cm rectangle lies in the xy-plane. What is the electric flux through the rectangle if E=(80.0i + 50k) N/C ? 2. Relevant equations Φ = E * A =EAcos(θ) 3. The attempt at a solution My attempt: First convert the rectangle units from cm to m. 4.50cm = 0.045m 3.60cm = 0.036m Find the area of the rectangle. A = 0.036m x 0.045m = 0.00162 m^2 Find the magnitude of the electric field. E = sqrt (50^2 + 80^2) = 94.34 N?C (aprox.) Multiply the two, electric flux = E * A = 0.15283 Nm^2 / C (aprox.) However, this answer is wrong. Could anyone point me in the right direction? I am not sure how to incorporate the cosine into this. Thank you.