A point charge Q=-400 nC and two unknown point charges.

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May 9th, 2015

The electric field due to Q is in positive x and positive y direction. The field in x direction has to be balanced only by q

since q2 can has a field only in y direction

Equating the x component of electric field due to Q with the field created by q1 gives

k*400/4*cos(30) = k*q1/1.3^2

q1= 146.358 nC (the electric field will be in the negative x direction)


May 9th, 2015

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May 9th, 2015
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May 9th, 2015
Sep 24th, 2017
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