Two equal +q point charges are placed along the x axis symmetrically about the o

Question

Two equal +q point charges are placed along the x axis symmetrically about the origin as shown the right. Is the electric field zero at all points along the y axis? If not, what can be said about the direction of the field at all points on the y axis? Ignore the field at the origin as you answer this question.

(a) The field is always parallel to the y axis, pointing in either the positive or negative yˆ direction.

(b) The field is sometimes, but not always, parallel to the y axis.

(c) The field is always perpendicular to the y axis.

(d) The field along the axis is zero.

Explanation / Answer

both charges are positive.so direction of electric field at all points of positive y axis is same and direction is positive y axis

direction of electric field at all points of negative y axis is same and direction is negative y axis.

so answer is (a).

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