Why does a charged particle attract light,neutral particles?

What is the total charge of the electrons in a neutral atom?

How does a simple paper electroscope work?

One metallic sphere $A$ is given a positive charge,whereas another identical metallic sphere $B$ of exactly the same mass as $A$ is given an equal amount of negative charge. Then:

Find the change in mass of a body if it is given a $+2 \, C$ charge.

$(a)$ $A$ comb run through one's dry hair attracts small bits of paper. Why? What happens if the hair is wet or if it is a rainy day? (Remember,a paper does not conduct electricity.)
$(b)$ Ordinary rubber is an insulator. But special rubber tyres of aircraft are made slightly conducting. Why is this necessary?
$(c)$ Vehicles carrying inflammable materials usually have metallic ropes touching the ground during motion. Why?
$(d)$ $A$ bird perches on a bare high power line,and nothing happens to the bird. $A$ man standing on the ground touches the same line and gets a fatal shock. Why?