Physics (AS & A Level) · Oct / Nov 2016 · Paper 11 · Question 2

The force F between two point charges q1 and q2, a distance r apart, is given by the equation F = \frac{kq_1q_2}{r^2} where k is a constant. What are the SI base units of k?

1. Akg m^3 s^{-4} A^2
2. Bkg m^3 s^{-4} A^{-2}
3. Ckg m^3 A^2
4. Dkg m^3 A^{-2}

As printed in the paper