The charges and coordinates of two charged particles held fixed
in an xy plane are q1 = +2.4
_C, x1 = 3.5 cm,
y1 = 0.50 cm and q2 = _4.2
_C, x2 = _2.0 cm,
y2 = 1.5 cm.
(a) Find the magnitude and direction of the electrostatic force
on particle 2 due to particle 1.
(b) At what x and y coordinates should a third
particle of charge q3 = +3.9 _C be
placed such that the net electrostatic force on particle 2 due to
particles 1 and 3 is zero?
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