- #1
ranger281
- 7
- 0
- Homework Statement
- Find the electric field above ring's center
- Relevant Equations
- ##d\vec{E}=\frac{dQ}{r^2}cos\theta \hat{z}##
The contribution coming from a little segment of the ring is ##d\vec{E}=\frac{dQ}{r^2}cos\theta \hat{z}##, assuming that the horizontal components cancel out. But how can we show that?