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## Homework Statement

A particle with charge Q is located on the Y axis a distance

*a*from the origin. A second particle with a charge q is played on the X axis a distance

*d*from the origin. The value of d for which the x component of the force on the second particle is the greatest is:

**a)0, b)a, c)root(2)*a, d) a/2, e) a/root(2)**

## Homework Equations

## The Attempt at a Solution

Here's my attempt at the problem so far,

I determined the x component of the force on the 2nd particle due to the first and I see what portion of the equation I must maximize but I don't see how to actually choose d (or solve d) such that it is maximized in terms of a.

Any ideas?