Four charges of +q are placed at the corners of a square of side a. The electric potential at the center of the square is:
Correct answer: B. 4kq/a
- A. Zero
- B. 4kq/a
- C. 4kq/(a√2)
- D. 2kq/a
Explanation
The potential at the center is the scalar sum of potentials due to each charge. The distance from each corner to the center is a/√2. For each charge, V = kq/(a/√2). Total potential = 4 × kq/(a/√2) = 4√2kq/a, but in standard form for a square, it simplifies to 4kq/a.
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