Electrostatics

Let $A$ and $B$ are two identical objects of same mass initially are charged electro statically by rubbing against each other. Let $A$ has got a positive charge and $B$ has got a negative charge, then match column I and column II.

Explain how materials are classified on the basis of electrical conductivity.

Silver,Gold,Aluminium,Mercury are the most effective electrical conductors.

Plastics, Styrofoam, paper, rubber, glass and dry air are common examples of _____.

What are the types of material on the basis of conduction of electricity?

Number of electrons flowing per second is a conductor carrying a current of $9A$ is _____

In a semiconductor 

If five charges are as follows $+q, +3q, -2q, -6q, +8q$, then what is total charge value?

For the addition of the charge, which one of the given things should be taken care of?

For the invariance of the charge, which of the given can be varied?

An insulated metallic sphere $\left(x\right)$ is charged and is covered by another insulated hollow metallic sphere $\left(y\right)$. If a connection is made between the two,

When ${10}^{19}$ electrons are removed from a neutral metal plate, the electric charge on it (in coulomb) is 

A positively charged glass rod is brought close to a metallic rod isolated from ground. The charge on the side of the metallic rod away from the glass rod will be

The event that will happen when we rub a glass rod with silk cloth is

When a positively charged body is brought near the metal disc of a neutral electroscope, its leaves -

Which device is used to detect the presence of charge on an object - lightning conductor or electroscope?

Which among the following is not an insulator?

Ground resistance should be designed such that

Inside a conductor, electric field is