Question

When an ebonite rod rubbed with fur, the fur develops a charge which is:
$A.$ positive
$B.$ negative
$C.$ neutral
$D.$ none of these

Answer 1

Hint:Here we will proceed by writing down the concept of electrification in order to find out about the charge a fur will develop on rubbing an ebonite rod.

Complete step-by-step answer:

Electrification – The process of developing charge in a body is called electrification. According to this theory, a body can be charged by the transfer of electrons. Every material is composed of atoms.
When we rub fur with an ebonite rod, the chemical bond is formed between some parts of the two surfaces. Rod has its electron more tightly bound than fur. So, fur donates electrons to the rod while electrons from the rod won’t come out. Due to excess electrons in the rod, it becomes negatively charged while the fur with lost electrons. Thus, fur becomes positively charged this is because on rubbing an ebonite rod with fur, the electrons from the fur get transferred to the ebonite rod. The fur now has a deficiency of electrons and so- it is positively charged.
On the other hand, an ebonite rod has an excess of electrons and hence is negatively-charged. So, we can say that the fur undergoes positive electrification.
In a nutshell, we can say that a fur will develop positive charge on rubbing with an ebonite rod.
Therefore, A is the correct option.

Note- Whenever we come up with this type of problem one should always remember that it is the electrons and not the protons that get transferred during positive as well as negative electrification.Thus, fur becomes positively charged. When an ebonite rod is rubbed with fur the rod gets negatively charged because the friction between the fur and the rod makes the ebonite rod to gain electrons from the fur. This is because, electrons in fur are less tight