# physics

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A point charge with charge q1 is held stationary at the origin. A second point charge with charge moves from the point (x1,0) to the point (x2,y2).

How much work is done by the electrostatic force on the moving point charge?

• physics -

Compute how the distance from the origin changes. That would be from
r1 = x1 to
r2 = sqrt(x2^2 + y2^2)

The work done moving the charge is
-k q1*q2/[(1/r2 - 1/r1]

You need to provide values for q2, q1, and the locations to compute the work in Joules.

• physics -

Why are the r's reciprocal??

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