Question

Identify the electric flux passing through a rectangle with sides of 46 m and 98 m found in a region with a uniform electric field of 700 N/C and an angle of 80º.

Answer 1

Given:

$A=\rm 46\: m\times 98\: m=4508\: m^2$

$E=700\:\rm N/C$

$\theta =80^\circ$

The electric flux passing through a rectangle

$$\phi=EA\cos\theta\\ =700*4508*\cos 80^\circ=5.5*10^5\: \rm N\cdot m^2/C$$