Two positive charges which are 0.1m apart repel each other with a force of 18N. If the sum of the charges be `9 muC`, calculate their separate values.

Two point charges of +3muC and +4muC repel each other with a force of 10 N. If each is given an additional charge of -6muC , the new force is

(a) Two identical spheres having positive charges are placed 3 m apart repel each other with a force 8 xx 10^(-3) N . Now charges are connected by a metallic wire, they begin to repel each other with a force of 9 xx 10^(-3) N . Find initial charges on the spheres. (b) Two identical spheres having charges of opposite sign are placed 3 m apart attract other with a force 2.4 xx 10^(-3) N . Now spheres are touched and then placed at original separation repel with a force 10^(-3) N . Find initial charges on the spheres.

Two point charges of +2 mu C and +6 muC repel each other with a force of 12N . If each is given an additional charge of -4 mu C , what will be the new force?

Two point charge separeted by a distance d repel each other with a force of 9 N. If the separat becomes 3d, the force of repulsion will be

Two point charges +6 mu C and +16 mu C repel each other with a force of 120N. If a charge of -8 mu C is added to each of them, then force between them will becomes

Two point charges +10 muC and +20 muC repel each other with a force of 100N. If a charge of-2 muC is added to each charge, then force between them will become

Two similar and equal charges repel each other with force of 1.6 N. When placed 3m apart Strength of each charge is -

Two point sized charged bodies repel each other with a force of 20 N when 30 cm apart in air. If their combined charge is 30 muC , find the charge present on each body.