1) Force = ma = 1.00 g (1kg / 1000 g) 225 m/s^2 = 0.225 N
2) Charge
Force = K (charge)^2 /(distance)^2 => charge = √ [Force distance^2 / k]
k = 9.00 10^9 Nm^2 / C^2
charge = √ [0.225 N (0.02 m)^2 / 9.00 10^9 N*m^2 / C^2 ]
charge = 0.0000001 C = 0.0001 mili C
