Question

When a glass rod is rubbed with a piece of silk cloth the rod:
$\left( A \right)$ And the cloth both acquire positive charge
$\left( B \right)$ Becomes positively charged while the cloth has a negative charge.
$\left( C \right)$ And the cloth both acquire a negative charge.
$\left( D \right)$ Becomes negatively charged while the cloth has a positive charge.

Answer 1

Electric charge is the result of excess or insufficiency of electrons (negatively charged particles) as compared to protons (positively charged particles). It will be achieved by the method of rubbing two materials against one another, throughout that the electrons migrate from one material to another.

Solution The most charge is carried by the electrons, and protons inside an atom. Electrons are said to hold a negative charge, whereas protons are said to hold a positive charge, though these labels are fully arbitrary.
Electric charges are often manufactured in many ways — once an ebonite rod is rubbed with fur (hairy materials) and that they also are produced when a glass rod is rubbed with silk.
Electrical charges are made after we rub the bottom of a pen on our bushy head, when two stones are rub along, etc. Electric Charges are developed when there is a gain or loss of electrons. If a body loses an electron, it's said to be positively charged. Whereas if a body gains an electron, then it's said to be negatively charged. A body will acquire a charge by ways such as Friction, Conduction, and Induction.
When a glass rod is rubbed with a chunk of silk fabric, transfer of charge takes place as a result of this glass the rod acquires a positive charge whereas the piece of silk material acquires a negative charge. Electrons from the glass rod tend to flow from the glass rod to the silk material.

So the $Option\left( B \right)$will be the right choice, that is it becomes positively charged while the cloth has a negative charge.

Notes: Electric charge is the property of matter that causes it to experience a force once placed in an electromagnetic field. There are two varieties of electric charges: positive and negative (commonly carried by protons and electrons respectively). An object with an absence of net charge is cited as neutral. Early information of However, charged substances interact is currently referred to as classical electrodynamics and continues to be accurate for issues that don’t need thought of quantum effects.