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Question 2016.S2.25: Two electrodes, whose cross-sectional view is shown in the f......

Two electrodes, whose cross-sectional view is shown in the figure below, are at the same potential. The maximum electric field will be at the point

(a) A       (b) B       (c) C       (d) D

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From the given cross-sectional view of the electrodes:
At A, the electric fields are additive, that is, \left|F_1+F_2\right|

At C, the electric fields are subtractive, that is, \left|F_1-F_2\right|

At D, electric field is only \left|F_2\right|

At B, the electric field is at an angle, that is,

\sqrt{F_1^2+F_2^2+2 F_1 F_2 \cos \theta}

Thus the electric field is the maximum at A.

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