Recent content by ewr

Hi, I found this on http://farside.ph.utexas.edu/teaching/302l/lectures/node32.html "Consider a charge placed in a uniform electric field (e.g., the field between two oppositely charged, parallel conducting plates). Suppose that we very slowly displace the charge by a vector displacement in...

Say a person is on a train moving to the right. He then flashes a light upwards perpendicular to the motion of the train. Directly on top of the person there is a mirror. If the light travels in a straight line why does it hit the mirror and bounce back? Why does the light act in a similar way...

Why is the electric flux defined as (electric field) x (area), Φ = EA? How do you come up with that equation? Is it because the electric flux is proportional to the charge and surface area?

In the problem attached, why is the integral become just the length of line cf?