Chapter 18, Problem 9P

& $\text{A**\#x00A0;+4}\text{.0 }\times {\text{ 10}}^{\text{-9}}\text{-C}$ charged object is 4.0 cm along a horizontal line toward the right of a $\text{- 3}\text{.0 }\times {\text{ 10}}^{\text{-}}{}^{\text{9}}\text{-C}$ charged object. Determine the $\stackrel{\to }{E}$ field at a point 3.0 cm directly above the negative charge.