Answer to Question #109425 in Electricity and Magnetism for James

Question

two points charges of +3.0uc and -7.00 uc are palced at x=0 and x+0.20 m. what is the magnitude of the electric field

Answer 1

What is the magnitude of the electric field at the point midway between them?

$E_+=k\frac{q}{r^2}=9\cdot10^9\cdot \frac{3\cdot10^{-6}}{0.1^2}=2700kV/m$

$E_-=k\frac{q}{r^2}=9\cdot10^9\cdot \frac{-7\cdot10^{-6}}{0.1^2}=6300kV/m$

$E_\Sigma=E_++E_-=2700+6300=9000kV/m$ Answer.