[header] How to calculate electric flux [title] Know the formula for electric flux. [substeps] The electric flux through a surface a is equal to the dot product of the electric field and area vectors e and a. the dot product of two vectors is equal to the product of their respective magnitudes multiplied by the cosine of the angle between them. [title] Determine the magnitude and direction of your electric field vector. 
[substeps] In most cases of this type, it is already given in the problem. [title] Determine the magnitude and direction of the surface area vector a.