Question
1.5: When
a glass rod is rubbed with a silk cloth, charges appear on both. A similar
phenomenon is observed with many other pairs of bodies. Explain how this
observation is consistent with the law of conservation of charge.
Answer :
Rubbing produces charges of equal magnitude but of opposite nature on
the two bodies because charges are created in pairs. This phenomenon of
charging is called charging by friction. The net charge on the system of two
rubbed bodies is zero. This is because equal amount of opposite charges
annihilate each other. When a glass rod is rubbed with a silk cloth, opposite
natured charges appear on both the bodies. This phenomenon is in consistence
with the law of conservation of energy. A similar phenomenon is observed with
many other pairs of bodies.
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