Where is electric potential zero? Help!
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Where is electric potential zero? Help!

[From: ] [author: ] [Date: 13-09-25] [Hit: ]
Any good answer will be given all 5 stars . Thank you!-The potential of a point charge at the origin is kq/r. Since potentials can be superposed,x = 0.The potential is zero at about 67 cm from the 4 uC charge.......
Two point charges of 4 microC and -2micro C are separated by a distance of 1 m in the air . At what point between them on the line joining the two charges is the electric potential zero ?

Please help . Any good answer will be given all 5 stars . Thank you!

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The potential of a point charge at the origin is kq/r. Since potentials can be superposed, the potential of the two charge system is
k q1 / x + k q2 / (d - x) = 0
q1 (d - x) + q2 x = 0
q1 d + (q2 - q1) x = 0
x = q1 d / (q1 - q2)
x = (4 uC)(1 m) / (4 uC - (-2 uC))
x = 0.67 m
The potential is zero at about 67 cm from the 4 uC charge.
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