Tag: electric charges and fields

At room temperature, conductivity is less because of obstruction from other ions.
At low pressure, this disturbance is reduced and hence gases become good conductors.

Total charge, $q=+2.4C$
Then by quantization of charge $q=ne$
$\therefore$ number of electrons, $\quad n=\cfrac { q }{ e } =\cfrac { 2.4C }{ 1.6\times { 10 }^{ -19 } } =1.5\times { 10 }^{ 19 }\quad \quad $

Answer is B.

If a negatively charged object is used to charge a neutral object by induction, then the neutral object will acquire a positive charge. And if a positively charged object is used to charge a neutral object by induction, then the neutral object will acquire a negative charge.
Hence, the process due to which an uncharged body acquires electric charges when held near a charged body is called induction.

When a glass rod is rubbed with silk and brought near a GLE, the leaves of the GLE appear to diverge further.
When the glass rod touches the brass of the disc of the GLE, the free electrons from it flow to the glass rod. This causes a deficiency of electrons on the brass disc. To make up for this deficiency the electrons from the fold leaves flow towards the disc. This in turn causes electron deficiency on the gold leaves. As gold leaves as positively charged, they repel each other and hence diverge. Therefore the glass rod has a negative charge.
Hence, the charge acquired by the silk is negative charge.

Rubbing the glass rod with the silk makes it lose electrons, so it becomes positively charged.similarly rubbing the fur with the ebonite makes it lose electrons and becomes positively charged.
Since, both glass rod and fur are positively charged and like charges repel each other. So, both the glass rod and fur will repel each other.

On rubbing an ebonite rod with fur or cat's skin, the electrons from the fur gets transferred to the ebonite rod. The fur now has a deficiency of electrons and so is positively-charged. On the other hand, the ebonite rod has an excess of electrons and hence is negatively-charged. In the above example, the fur undergoes positive electrification. It should be noted that it is the electrons and not the protons that get transferred during positive (and negative) electrification.
Therefore, in this case of electric conduction, the fur losses it electrons to the ebonite rod.

On rubbing a glass rod with silk, the electrons from the glass rod get transferred to the silk. The silk now has an excess of electrons and so is negatively-charged. On the other hand, the glass rod is deficient in electrons and hence is positively-charged.
In the above example, the silk undergoes negative electrification.
Therefore, in this case of conduction, the glass rod losses it electrons to the silk.

The charge acquired by the glass rod when it is rubbed with silk is positive since electrons get transferred from glass rod to silk.