Why does a glass rod become positively charged when it is rubbed with a silk cloth?

the electrons from the glass rod are transferred to the silk cloth.

the protons from the glass rod are transferred to the silk cloth.

all the charges from the glass rod are transferred to the silk cloth.

all the charges from the silk cloth are transferred to the glass rod.

the protons from the silk cloth are transferred to the glass rod.

The electrons from the glass rod are transferred to the silk cloth.

When glass rod is rubbed with a silk cloth, there is transfer of electrons from the glass rod to the silk cloth. Hence, the glass rod becomes positively charged because of loss of electrons and silk cloth becomes negatively charged because of gain of electrons. This method of charging is known as charging by friction.

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

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