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Question

A glass rod is rubbed with silk. Explain the charging of the glass rod and the silk on the basis of electron movement.

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Solution

A glass rod is rubbed with silk. Glass rod loses electrons and becomes positively charged.
Silk gains electrons and becomes negatively charged.

Explanation: Suppose glass rod in neutral form, has 10 protons and 10 electrons i.e. 10 units of positive charge and 10 units of negative charge.
While silk has (in the neutral state) 7 electrons and 7 protons (suppose) i.e. 7 units of negative charge and 7 units of positive charge.

Suppose on rubbing together glass rod loses 2 electrons and silk gains 2 electrons.

Now glass rod has 8 electrons and 10 protons on it. i.e. 8 units of negative charge and 10 units of positive charge i.e. glass rod has net 2 units of positive charge. Thus, the glass rod has acquired a positive charge. Silk now has 9 units of negative charge and 7 units of positive charge i.e. silk has net 2 units of negative charge. Thus, silk has acquired a negative charge.


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