Posted by Char on Sunday, April 3, 2011 at 10:49pm.
Particles 1 and 2 of charge q1 = q2 = +3.20 x 1019 C are on a y axis at distance d = 22.0 cm from the origin. Particle 3 of charge q3 = +9.60 x 1019 C is moved gradually along the x axis from x = 0 to x = +5.0 m.
At what value of x will the magnitude of the electrostatic force on the third particle from the other two particles be maximum?
What is the maximum magnitude?

Physics  please help!  drwls, Monday, April 4, 2011 at 1:58am
Is particle 2 at x = 0, y = 22 cm?
If so, the net force on P3, F3, is always along the x axis, and is zero at x=0.
F3 = 2*k*q1*q3*x/(x^2 + a^2)^3/2
where a = 22 cm
Maximum force occurs where dF3/dx = 0
I get it to be where x = 22 cm/sqrt2 = 15.55 cm
See what you get, and use the equation above to get the maximum force F3
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