Physics

Problem

A point charge of

-4.0\,\mu\text{C}

is placed at the origin of an

x

–

y

coordinate system. Determine the electric field vector at the point

(0.30\,\text{m},\;0.40\,\text{m})

. Express your answer in unit-vector notation

(\hat{i},\hat{j})

with appropriate units. Use

k=9.0\times10^{9}\,\text{N m}^2\text{C}^{-2}