When glass rod is rubbed with silk the charging or transfer of charge is due to the process of

Option 1 : Loses electrons

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Concept:

• Charging: Charging means gaining or losing an electron. Matters can be charged in three ways, charging by friction, charging by contact, and charging by induction.
• Charging by friction: When you rub one material to another, they are charged by friction. Material losing electron is positively charged and material gaining electron is negatively charged. The amount of gained and the lost electron is equal to each other.

• Charging by contact: There are equal numbers of electrons and protons in a neutral matter. If something changes this balance we can say it is charged.
  • ‘A’ charged body (e. g; positively charged metal can) is brought in contact with uncharged body ‘B’. When in contact, negative charges from the uncharged body are attracted by the positive charges of the metal can. Finally, body B will remain with a net positive charge. Therefore, body B has been charged with positive charges.

• Charging by induction: A charged object is brought close to but does not touch the conductor. In the end, the conductor has charge of the opposite sign as the charge on the object. It is the process of charging by induction.

Explanation:

• During the process of charging by friction, the electrons are transferred from one material to another material.
• If a dry glass rod is rubbed with silk cloth the glass rod gives out negative electrons, and therefore, becomes positively charged.
• The silk cloth receives negative electrons and therefore it becomes negatively charged. 

So, When a Silk cloth is rubbed with a glass rod, the glass rod Loses electrons.

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