Two opposite point charges, each of magnitude Q are separated by a distance s. The electric potential at a point mid-way between them is:
Correct answer: D. zero
- A. q
- B. -kq/s
- C. infinity
- D. zero
Explanation
Potential is a scalar, kq divided by r, so at the midpoint the plus Q and minus Q, being at equal distances, give equal and opposite potentials that add to zero. The electric field at that point is not zero, since both charges push a test charge the same way, which is the usual confusion.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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About Electric Potential
Electric potential is the work done per unit positive charge in bringing it from infinity to a point, while potential difference compares energy change between two points. Work includes potential due to point charges, superposition of scalar potentials, equipotential surfaces, and the relation between electric field and potential.
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