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!
Please help . 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, 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.
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.