(adsbygoogle = window.adsbygoogle || []).push({}); Question:

Electric charge is distributed uniformly along each side of a square. Two adjacent sides have positive charge with total charge + Q on each. Each side of the square has length a.

Image at bottom.

Part A:

Suppose the other two sides have negative charge with total charge - Q on each. What is the x-component of the net electric field at the center of the square? Give your answer in terms of Q, a, and epsilon_0.

The electric field at the origin would point away from the positive charge and point towards the negative charge. The x-components would both be in the -x direction and equal in magnitude.

I thought all I had to do was double the equation for an electric field with Q as the charge and (.5a) as the distance.

My answer was - (2)*(Q) / (Pi* a^(2) * (epsilon_0).

Because this is a Mastering Physics question and I was close, my feedback was "Your answer is off by a multiplicative factor."

What did I do wrong?

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# Homework Help: Electric field at the center of a square homework

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