Why can metal rods not be charged by holding them in hands?

Fill in the blanks:
$(i)$ $A$ static charge produces a ...... field around it. (Electric,Magnetic)
$(ii)$ $A$ moving charge produces a ...... field around it.

Write the law of conservation of charge. Give one example.

$(a)$ $A$ 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?

How can a neutral body be charged electrically?

How much positive and negative charge is there in a cup of water $(250 \; g)$?