PHYSICS
posted by JOTHEY .
A 3.0 nC charge is on the xaxis at x = 10 cm and a +4.0 nC charge is on the xaxis at x = 20 cm.
At what point or points on the yaxis is the electric potential zero?

electric potential is the scalar addition of each component.
V= kq/r+ kq/r= k3.0nC/(r+0.10)+k4nC/(r0.20)
at V=0
3(r.20)=4(r+.10)
r= .6.4= 1meter
check V(1)=k(3)/(.9)+k4/(1.2)=0
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