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Electric Fields Due to Three Uniform Planes of Charge

EANDM-S1PB07

The figure below shows three planes of uniform surface charge density. The sheets of charge density are much larger than the spacing between the sheets. Note: the figure is not to scale. The left and right planes have a surface charge density $+\sigma$ Coulombs per square meter, whereas the center plane has a surface charge density $-2 \sigma$ Coulombs per square meter.

At which of the points A-D in the figure is the electric field equal to zero? Select ALL that apply.​

A

A

B

B

C

C

D

D

E

The electric field is non-zero at all of the points in the figure.