The electric field strength at a distance of 3.0 × 10-8 m from a nucleus is 2.5 × 108 N C-1. What is the charge on the nucleus?
1.6×10−19 C1.6 \times 10^{-19}\text{ C}1.6×10−19 C
2.5×10−17 C2.5 \times 10^{-17}\text{ C}2.5×10−17 C
8.3×10−10 C8.3 \times 10^{-10}\text{ C}8.3×10−10 C
2.3×10−7 C2.3 \times 10^{-7}\text{ C}2.3×10−7 C
