A conductor has $14.4 \times {10^{ - 19}}coulombs$ positive charge. The conductor has(Charge on electron $ = 1.6 \times {10^{ - 19}}coulombs$)
$9$ electrons in excess
$27$ electrons in short
$27$ electrons in excess
$9$ electrons in short
$(a)$ 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?
Find change in mass of a body if it is given $+2C$ charge.
Write the law of conservation of charge. Give one example.
What is static electrical induction ?
A soap bubble is given a negative charge, then its radius