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Q. In a certain region of space, the electric field, E, is constant in direction (say horizontally in the +x-direction), but its magnitude decreases from E1 = 533.3 N/C at x = 0 to E2 = 415.3 N/C at x = 47.1 (NOT at x = 30 m). Conclude the charge within a cubical box of side L = 47.1 m, where box is oriented so that four of its sides are parallel to the E-field lines.

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