Question

Four charges $2 C ,\,-3 C ,\,-4\, C$ and $5\, C$, respectively, are placed at all the corners of a square. Which of the following statements is true for the point of intersection of the diagonals?

• A. Electric field is zero but electric potential is nonzero
• B. Electric field is non-zero but electric potential is zero
• C. Both electric field and electric potential are zero
• D. Neither electric field nor electric potential is zero

Answer 1

Answer: (B)

$V=9 \times 10^{9}\left[\frac{2}{r}-\frac{3}{r}-\frac{4}{r}-\frac{5}{r}\right]=0$
Electric fields due to all the charges shall not cancel out because of different directions.