Three very large square planes of charge are arranged as shown (on edge) in Fig.

Question

Three very large square planes of charge are arranged as shown (on edge) in Fig. 21-70. From left to right, the planes have charge densities per unit area of -0.50

Three very large square planes of charge are arranged as shown (on edge) in Fig. 21-70. From left to right, the planes have charge densities per unit area of -0.50 mu C/m2, +0.15 mu C/m2, and -0.50 mu C/m2. Find the total electric field (direction and magnitude) at the points A, B, C, and D. Assume the plates are much larger than the distance AD. point A point B point C point D

Explanation / Answer

A.)E= - 0.5 x10^-6/8.85 x10^-12 + 0.15 x10^-6/8.85 x10^-12 - 0.5 x10^-6/8.85 x10^-12

= - 96045.19 N/C

Direction is towards right

B.)E= + 0.5 x10^-6/8.85 x10^-12 + 0.15 x10^-6/8.85 x10^-12 - 0.5 x10^-6/8.85 x10^-12

= + 16949.15 N/C

Direction is towards left

C.)E= + 0.5 x10^-6/8.85 x10^-12 - 0.15 x10^-6/8.85 x10^-12 - 0.5 x10^-6/8.85 x10^-12

= - 16949.15 N/C

Direction is towards right

D.)E= + 0.5 x10^-6/8.85 x10^-12 - 0.15 x10^-6/8.85 x10^-12 + 0.5 x10^-6/8.85 x10^-12

= + 96045.19 N/C

Direction is towards left

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