Complete the following sentences:
A glass rod is rubbed with silk. The charge on glass rod is ...... and the charge on silk is ......

p o s i t i v e, p o s i t i v e

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n e g a t i v e, n e g a t i v e

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p o s i t i v e, n e g a t i v e

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n e g a t i v e, p o s i t i v e

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Solution

The correct option is C $p o s i t i v e, n e g a t i v e$
On rubbing a glass rod with silk, the electrons from the glass rod get transferred to the silk. The silk now has an excess of electrons and so is negatively-charged. On the other hand, the glass rod is deficient in electrons and hence is positively-charged.
In the above example, the silk undergoes negative electrification.
Therefore,when a glass rod is rubbed with silk. The charge on glass rod is positive and the charge on silk is negative.

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Similar questions

When a glass rod is rubbed with a piece of silk cloth, then :

(a) the glass rod and silk cloth both acquire the positive charge.

(b) the glass rod becomes positively charged while the silk cloth has a negative charge.

(d) the glass rod becomes negatively charged while the silk cloth has a positive charge.

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?

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