What is called the polarity of electric charge?

When is a charge considered a point charge?

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?

The electric charge on an $\alpha$-particle is ....... .

Give the differences between charge and mass.

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