Question: What is the electric field due to a point charge of -4 µC at a distance of 0.25 m?

Options:

1. -5760 N/C
2. -1440 N/C
3. 5760 N/C
4. 1440 N/C

Correct Answer: -5760 N/C

Solution:

E = k * |q| / r^2 = (8.99 x 10^9 N m²/C²) * (4 x 10^-6 C) / (0.25 m)^2 = -5760 N/C.