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His notes say "the total e field is the vector sum over all the N charges. If we line up our axes so that the charges are on the x-axis then we get..."

a really long equation. (i would write it here, but there's no way to get all the equations symbols!)

THe equation has a x' in it, and he has no idea what the notation means.

im probably not making any sense to anyone, but i just wanted to see if i could help him (im studying for a law degree so this is all spanish to me!)

thanks so much,

charlotty