Question

Four equal charges each of value $15\mu C$ are placed at the four corners of a square of side $10cm$. Calculate the resultant electric field at the centre of the square

• A. $15\times {10}^{-6}V{m}^{-1}$
• B. $15\times {10}^{6}V{m}^{-1}$
• C. Zero
• D. $30\times {10}^{-6}V{m}^{-1}$

Answer 1

Answer: (C)

Zero

At the center, Electric field due to charges at B are equal and opposite to electric field at D.
And also, electric field at center due to C are equal and opposite to that due to A. So, net electric field at center is zero. Since each charge is of equal magnitude and at equal distance from center O.