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March 25, 2017

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A -3.0 nC charge is on the x-axis at x = -10 cm and a +4.0 nC charge is on the x-axis at x = 20 cm.

At what point or points on the y-axis is the electric potential zero?

  • PHYSICS - ,

    electric potential is the scalar addition of each component.

    V= kq/r+ kq/r= -k3.0nC/(r+0.10)+k4nC/(r-0.20)

    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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