A glass marble is rubbed against a piece of silk. As a result the piece of fabri

Question

A glass marble is rubbed against a piece of silk. As a result the piece of fabric acquires extra electrons. What happens to the glass marble? Check all that apply. Check all that apply. The marble has lost the same number of electrons acquired by the piece of silk. The marble has acquired the same number of electrons acquired by the piece of silk. The marble acquires a positive charge and repels the piece of silk. The marble acquires a positive charge and attracts the piece of silk. The marble acquires a negative charge and attracts the piece of silk. The marble acquires a negative charge and repels the piece of silk.

Explanation / Answer

Solution: It is given that the piece silk fabric acquires extra electrons when a glass marble is rubbed against it. Due to rubbing action of marble on the silk piece, the marble looses few electrons which are acquired by the piece silk fabric.

Number of electrons lost by the marble must the same as that of the number of electrons gained by the silk piece.

Since marble has lost electrons, it gains the positive charge and silk piece gains equal and opposite negative charge due to addition of electrons. The positive and negative charge exerts attractive force on each other.

Hence the correct multiple options are;

The marble has lost the same number of electrons acquired by the piece of silk.

The marble acquires a positive charge and attracts the piece of silk.

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