Faraday is the unit of

Why do light particles like pith balls attract towards a charged rod?

From what word is the name 'electricity' coined? Explain its meaning.

Discuss the method of charging two spheres without contact.

Two identical spherical conductors $B$ and $C$ have equal radii and carry equal charges. They repel each other with a force $F$ when placed at a certain distance apart. $A$ third identical spherical conductor $A$,which is uncharged,is brought in contact with $B$ and then removed. It is then brought in contact with $C$ and removed. What is the new force of repulsion between $B$ and $C$?

The nature of binding for a crystal with alternate and evenly spaced positive and negative ions is