Two point charges, Q 1 = 3.1 ? C and Q 2 = -1.6 ? C , are placed on the x axis.

Question

Two point charges, Q1 = 3.1?C and Q2 = -1.6?C , are placed on the x axis. Suppose that Q2 is placed at the origin, and Q1 is placed at the coordinate x1 = ? 4.0

At what point(s) along the x axis is the electric field zero? Determine the x-coordinate(s) of the point(s).

At what point(s) along the x axis is the potential zero? Determine the x-coordinate(s) of the point(s).

At what point(s) along the x axis is the potential zero? Determine the x-coordinate(s) of the point(s).cm

At what point(s) along the x axis is the electric field zero? Determine the x-coordinate(s) of the point(s).

Explanation / Answer

because electric field =0 s0 K*3.1*10^-6/R^2 =K*1.6*10^-6/(R-4)^2

by solve this we get R = 14.22 and x coordinate = 10.22

the point where potination = 0 , K*3.1/R = k*1.6/(R-4)

so R = 8.26 and x coorniate = 4.26

but there is another where potination = 0

it's x coordinate = -1.37

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