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A charge q 1 = - 4 q is at the origin, and a charge q 2 = + q is on the x -

A charge

q_{1} = - 4 q

is at the origin, and a charge

q_{2} = + q

is on the

x -

axis at

x = a,

where

a > 0 .

Find the expression

E_{x} 0

for the total electric field on the

x -

axis in the region

x 0.

Use

k

to represent Coulomb's constant.

E_{x} 0=kq(\frac{4}{x^{2}}-\frac{1}{(x + a)^{2}})

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