Electrostatics Question 497
Question: A square of side a has charge Q at its centre and charge -q? at one of the corners. The work required to be done in moving the charge -q? from the corner to the diagonally opposite corner is [UPSEAT 2004]
Options:
A) Zero
B) $ \frac{Qq}{4\pi {\in _{0}}a} $
C) $ \frac{Qq\sqrt{2}}{4\pi {\in _{0}}a} $
D) $ \frac{Qq}{2\pi {\in _{0}}a} $
Show Answer
Answer:
Correct Answer: A
Solution:
From symmetry the all corner have same electric potential. Therefore work done in moving the charge q from the corner to the diagonally opposite corner is zero.
