Why does a glass rod rubbed against silk cloth acquire positive charge why not negative?

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Solution

Dear student, When an object is charged by rubbing it against another object, the two objects get oppositely charged. By convention, it is considered that the charged acquired by the glass rod is positive and charged acquired by the cloth is negative. Therefore, the rod becomes positively charged and the cloth becomes negatively charged. Regards

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A glass rod is rubbed with a silk cloth and an inflated rubber balloon is rubbed with a woollen cloth.

Now, out of glass rod, silk cloth, rubber balloon and woollen cloth:

(a) Which two objects acquire negative charge?

(b) Which two objects acquire positive charge?

A glass rod is rubbed with silk cloth. What type of charge is acquired by (a) silk cloth, (b) glass rod?

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