The number of electrons in $1.6 \, C$ charge will be

Assertion $(A)$: Electromagnetic force is enormously strong as compared to gravitational force. Yet,gravity dominates in large-scale phenomena (e.g.,formation of galaxies).
Reason $(R)$: Existence of positive and negative charges makes matter mostly electrically neutral.
Which of the following is true?

Consider a neutral conducting sphere. $A$ positive point charge is placed outside the sphere. The net charge on the sphere is then,

The net electric charge of a conductor does not change when:

$A$ body can be negatively charged by which of the following methods?

From the following,what charges can be present on oil drops in Millikan's experiment? (Here $e$ is the electronic charge)