Two uniformly charged, infinite, nonconducting planes are parallel to a yz plane and positioned at x = -42 cm and x = +42 cm. The charge densities on the planes are -41 nC/m2 and +21 nC/m2, respectively. What is the magnitude of the potential difference between the origin and the point on the x axis at x = +84 cm? (Hint: Use Gauss' law for planar symmetry to determine the electric field in each region of space.)
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