Three Infinite Planes of Charge,A,B and C,are Vertical and Parallel $\overrightarrow { \mathbf { E } } _ { \mathrm { I } }$

question 78

Multiple Choice

Three infinite planes of charge,A,B and C,are vertical and parallel to one another.There is a uniform electric field $\overrightarrow { \mathbf { E } } _ { \mathrm { I } }$ to the left of plane A and a uniform electric field $\overrightarrow { \mathbf { E } } _ { \text {II } }$ to the right of plane C.The field $\overrightarrow { \mathbf { E } } _ { \mathrm { I } }$ points to the left and the field $\overrightarrow { \mathbf { E } } _ { \text {II } }$ points to the right.The signs of the charges on plates A,B and C may be

• A)-,-,-.
• B)+,-,-.
• C)+,-,+.
• D)+,+,+.
• E)any one of the above.

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