Correct Answer is: B) 3 x 10-9
The stat coulomb is the unit of electric charge quantity in the cgs (centimetre/gram/second) system. It is approximately equal to the charge contained in 2.082 x 10⁹ electrons.
When two objects, carrying like electrical charges of 1 stat coulomb each, are placed so their charge centers are one centimetre (1 cm) apart, the objects repel each other with a force of one dyne (1 dyne).