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Two point charges q1 and q2 are situated at a distance d. There is no such point in between them where the electric field is zero. What can we deduce?

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Two point charges q1 and q2 are situated at a distance d. There is no such point in between them where the electric field is zero. What can we deduce?

(a) There is no such point

(b) The charges are of the same polarity

(c) The charges are of opposite polarity

(d) The charges must be unequal

This question was posed to me at a job interview.

Question is taken from Electric Field topic in section Charges and Fields of Physics – Class 12

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The correct answer is (c) The charges are of opposite polarity

Easiest explanation: If both the charges are of the same polarity (maybe of unequal magnitude), there must be a point in between them where the electric field intensities of the charges are of equal magnitude and in opposite direction. Hence they balance each other and the net field intensity must be zero. But if the charges are of opposite polarities their field intensities aid each other and net field intensity can never be zero.

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