1. The problem statement, all variables and given/known data A uniform electric field with a magnitude of 1100 N/C points in the positive x direction as shown above. A positive charge of +4.4 μC starts at point A, then moves to point B, then to point C and then back to point A. What is the difference in electrical potential between points B and C. [PLAIN]https://wug-s.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?cc/DuPage/Phys1202/fall/homework/Ch-20-Potential/V_from_E_field/E-field.jpg [Broken] 2. Relevant equations E=-Δ/ΔS https://www.physicsforums.com/newthread.php?do=newthread&f=153 [Broken] 3. The attempt at a solution Well, I used the Pythagorean theorem to find the 3rd side of triangle which was 10. Then I divided that by 100 to get it into meters. Then I multiplied it by the electric field magnitude (1100) to get -110 V. But I know that I have to multiply by cos of some angle. From this picture it looks like that the angle is 135 degrees. But when I multiply this by 110 i get 77.78 V. This answer is wrong. Please show me what I am doing wrong. I know this is a super ez problem.