Recent content by davezhan

1. Consider the electric dipole on the x-axis where a positive charge q is at (a,0) and a negative charge -q is at (-a,0) such that the distance between the two charges is 2a. Show that the electric field at a distant point on the +x axis is E(x)= 4kqa/x^3. 2. Homework Equations ...

Thank you for your help! The above post helped to clarify things tremendously.

I'm having a brain freeze and have a hard time understanding why the area of the ring is 2*pi*a*da. Can someone explain why it is the circumference times da? Link to derivation: www.phys.uri.edu/~gerhard/PHY204/tsl36.pdf