Coulombs Law Multiple Charges Example Problem #2

Описание к видео Coulombs Law Multiple Charges Example Problem #2

Four charges are arranged in a square, as shown. Charges 1, 2 and 3 are known. Charges 2, 3 and 4 are fixed in place. Distances between all the charges is given. What is the magnitude and sign of charge #4 if charge 1, free to move, stays still?

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