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Practice MCAT Question - Q17 - Answer!

Two electrically neutral materials are rubbed together. One acquires a net positive charge. The other must have

A.  lost electrons.
B.  gained electrons.
C.  lost protons.
D.  gained protons.

The correct answer is (B). Protons are fixed in the nucleus and cannot be transferred by friction. Electrons can be transferred by friction. Therefore, net charges are due to the transfer of electrons between two bodies. Conservation of charge means that if there is a net positive charge, one body must have lost electrons and the other body must have gained the electrons.

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