Electric forces between two charged objects tend to be much stronger in magnitude than the attractive gravitational force between them. Two particles of masses 1.66 kg and 2.1 kg and charges 9.06 μC and −6.48 μC respectively are separated by a distance 18.9 cm. Find the magnitude of the ratio of the gravitational to electric forces between them.

Electric forces between two charged objects tend to be much stronger in magnitude than the attractive gravitational force between them. Two particles of masses 1.66 kg and 2.1 kg and charges 9.06 μC and −6.48 μC respectively are separated by a distance 18.9 cm. Find the magnitude of the ratio of the gravitational to electric forces between them.