Q.When a glass rod is rubbed with a silk cloth the charge acquired by glass rod is

Charging by friction just moves electrons from one material to the other - it never creates charge.

When two different insulating materials are rubbed together, electrons are transferred from the material that holds them less tightly to the one that holds them more tightly. This is a property of the two materials (their position in the triboelectric series), not something created by the rubbing itself - the TOTAL charge of the glass+silk system stays zero (conservation of charge).

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A charge at rest produces only a static electric field; a moving charge additionally produces a magnetic field.

A charge produces an electric field around it regardless of its state of motion. However, a magnetic field is produced only by a moving charge (i.e., by a current). So a charged particle that is stationary (at rest) produces an electric field only, with no …

A body's charge changes only through the gain or loss of electrons, never protons, so a positive charge always means a deficit of electrons.

Protons are locked inside the nucleus and cannot be added to or removed from a body by ordinary charging processes (friction, conduction, induction). Only the loose outer electrons can transfer between bodies.

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