Question

Two point charges $q_1=4\mu C$ and $q_2=-4\mu C$ are located 40 cm apart in free space. The electric field at the mid point of the line joining $q_1$ and $q_2$ is

• A. \(9 \times 10^5 \text{NC}^{-1}\) towards $q_1$
• B. \(9 \times 10^5 \text{NC}^{-1}\) towards $q_2$
• C. \(18 \times 10^5 \text{NC}^{-1}\) towards $q_1$
• D. \(18 \times 10^5 \text{NC}^{-1}\) towards $q_2$
• E. zero

Hint:

For equal and opposite charges, the field at the exact midpoint is always twice the field of a single charge, pointing towards the negative charge. If the charges were identical, the field at the midpoint would be zero.

Answer 1

The Correct Option is D