NCFE Physical Science Practice Exam

The method of transferring charge through the rubbing of two objects together is known as friction. When two materials are rubbed against each other, electrons may be transferred from one material to another due to the differences in their electron affinity. This process results in one object becoming positively charged (having lost electrons) and the other becoming negatively charged (having gained electrons). The frictional contact causes a physical interaction that allows charge transfer, leading to an imbalance of electrical charges on the surfaces of the objects involved.

Other options like induction and conduction describe different mechanisms of charge transfer. Induction involves the redistribution of electric charge in an object due to the presence of a charged object nearby, without direct contact. Conduction is the process of transferring charge through direct contact, such as when two conductive materials touch. Convection, on the other hand, pertains to the transfer of heat or matter due to the movement of fluids and is not relevant to charge transfer.