Question

When a plastic spoon is rubbed on a woollen cloth and held above a mixture of salt and pepper, pepper jumps to the spoon. Choose the best reason for this: a) Air pushes the pepper towards the spoon. b) The spoon temporarily gets magnetised. c) The spoon temporarily gets charged with static electricity. d) Gravitational attraction pulls the pepper to the spoon.

Answer 1

c) The spoon temporarily gets charged with static electricity.

Step-by-step explanation:

Static electricity is the electric charge that arises on the material's surface. This is caused when the two positive and the negative charges come in contact with each other. The electricity generated finds an escape from the object's surface.

Rubbing the spoon makes it negatively charged while the sat and pepper have positive charge.

Between salt and pepper, it is the pepper that jumps to the spoon because it is lighter than salt.