Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: HW Help: Electric Potential

  1. Sep 21, 2005 #1
    Two charges are placed along the x-axis; 3uC at 14 cm, and -4uC at 15 cm. Find those points along the x-axis where the potential is zero. (u = micro or 10^-6)
  2. jcsd
  3. Sep 21, 2005 #2


    User Avatar
    Homework Helper

    Well, what have you done? you know potential is a scalar quantity, simply solve for r.
  4. Sep 21, 2005 #3
    when i solve it, the v=q/r which means r = q/v, if v=0 then r=q/0. does that means r= infinite or r=zero. im thinking infinite.
  5. Sep 23, 2005 #4


    User Avatar
    Homework Helper

    Andy, the r's in the equation is the distance from the particular charge up to the point where you want to calculate the potential. Write r2 in terms of r1 and the separation beween them before you solve for V1 = -V2. Try to solve for all three cases in between the two charges and on both sides outside of the two.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook