Three infinite insulating plates are placed parallel to each other with the same distance a, as shown. The charge densities of plates are o = + 5.20 µC/m², 02= - 10.20 µC/m² and ơ3 =+ 15.20 µC/m². Find the electric field at, (a) region 1, (b) region 2, (c) region 3 and (d) region 4. Region 1 Region 2 Region 3 Region 4 O2 -a → a-

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