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OpenStudy (anonymous):
Consider three infinite (nonconducting) sheets of charge placed side by side as with their cross-sections shown below. The left (L) and right (R) sheets have surface charge densities +σ and -σ, respectively. The charge density of sheet M located in between L and R is not known. It was found that the net force on a test charge placed at point P is zero. What is the charge density of sheet M?
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