When a glass rod is rubbed with a silk cloth, it acquires a positiv...

Question

When a glass rod is rubbed with a silk cloth, it acquires a positive charge of $4.8	imes10^{-17}$ C. In the process, find the number of electrons and protons transferred respectively.

Accepted Answer

Step 1: Charge $Q = ne \Rightarrow n = Q/e = \dfrac{4.8\times10^{-17}}{1.6\times10^{-19}} = 300$.

Step 2: When glass is rubbed with silk, electrons transfer FROM the glass TO the silk (glass becomes positively charged); protons never transfer in rubbing.

Step 3: So 300 electrons and 0 protons are transferred.

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