GEOLOGY

Detailed explanation-1: -Two like electric charges, both positive or both negative, repel each other along a straight line between their centres. Two unlike charges, one positive, one negative, attract each other along a straight line joining their centres.

Detailed explanation-2: -In contrast to the attractive force between two objects with opposite charges, two objects that are of like charge will repel each other. That is, a positively charged object will exert a repulsive force upon a second positively charged object. This repulsive force will push the two objects apart.

Detailed explanation-3: -Now take two glass rods (positively charged) and bring them near each other, repulsion takes place. Similarly, if we take two negatively charged ebonite rods and suspend one of them and bring the second rod near it again the suspended rod moves away showing repulsion between like charges.

Detailed explanation-4: -If two positive charges interact, their forces are directed against each other. This creates a repellent force as shown in the illustration. (The same occurs with two negative charges, because their respective forces also act in opposite directions.)

Detailed explanation-5: -Therefore, like charges repel and unlike charges attract.