What is the force between two small charged spheres having charges of 2×10−7 C and 3×10−7 C placed 30 cm apart in air?

2×10−7 N 3×10−7 N $0.3\; N$ 6×10−3 N

6×10−3 N

F = kq1q2/r2 q1 = 2×10−7 C ; q2 = 3×10−7 C ; r = 0.3 m F = 6×10−3 N