# A charge q1 = 7 μC is located at the origin, and a second charge q2 = -5 μC is located on the positive x-axis, 0.3 m from the origin. Find the electric field at point P, which has coordinates (0,0.4) m. Coulomb constant is given by

A charge q

_{1}= 7 μC is located at the origin, and a second charge q_{2}= -5 μC is located on the positive x-axis, 0.3 m from the origin. Find the electric field at point P, which has coordinates (0,0.4) m. Coulomb constant is given by K_{e}= 1/4πε_{o}is the = 8.99 × 109 Nm^{2}/C^{2}, ε_{o}is the permittivity of free space; $(\widehat i,\widehat j)$ are the unit vectors along x, y axes.### Right Answer is:

$(1.1\widehat i + 2.5\widehat j) \times {10^5}N/C$

#### SOLUTION

The Electric potential field is given by

$E = \dfrac{Q}{{4\pi {\varepsilon _o}{r^2}}}{\widehat a_r}$