AP® Physics 1 & 2

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Difficult

Straight-Line Charges Field Mag

APPH12-NMCQNK

Two charges are arranged in a straight line with point P, as shown in the diagram above.
Which one of the following is a correct expression for the magnitude of the net electric field at point P?

A

$\frac{kQ}{2d^2}$

B

$\frac{5kQ}{2d^2}$

C

$\frac{7kQ}{2d^2}$

D

$\frac{5kQ}{d^2}$