Gauss's Law: how do I calculate net electric field?

Brittn

New member
http://session.masteringphysics.com/problemAsset/1054114/3/YF-22-63.jpg

Positive charge Q is distributed uniformly over each of two spherical volumes with radius . One sphere of charge is centered at the origin and the other at x=2R

Find the magnitude of the net electric field due to these two distributions of charge at x=3R on the x-axis.

I'm not getting the correct answer, can someone explain to me how to calculate this?
 
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