Question: What is the electric field strength at a distance of 0.2 m from a point charge of +5 µC?

Options:

1. 112.5 N/C
2. 112.5 kN/C
3. 25 N/C
4. 25 kN/C

Correct Answer: 112.5 N/C

Solution:

E = k * |q| / r^2 = (8.99 x 10^9 N m²/C²) * (5 x 10^-6 C) / (0.2 m)^2 = 112.5 N/C.