How conductors and non-conductors are different ? Why are they not charged by rubbing them with our hands ?
How conductors and non-conductors are different ? Why are they not charged by rubbing them with our hands ?
Those which allow electricity to pass through them easily are called conductors.
They have free electrons to move inside the material.
E.g. : Metals, human and animal bodies and earth are conductors.
Those which doesn't allow electricity to pass through them are called insulators.
Most of the non-metals like glass, porcelain, plastic, nylon, wood offer high resistance to thepassage of electricity through them.
When some charge is transferred to a conductor, it readily gets distributed over the entire surfaceof the conductor. In contrast, if some charge is put on an insulator, it stays at the same place.
When metal rod is rubbed with hand, no electric charge is obtained because charges on metalleak through our body to Earth.
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A small sphere of radius $r_{1}$ and charge $q_{1}$ is enclosed by a spherical shell of radius $r_{2}$ and charge $q_{2} .$ Show that if $q_{1}$ is positive, charge will necessarily flow from the sphere to the shell (when the two are connected by a wire) no matter what the charge $q_{2}$ on the shell is.
A small sphere of radius $r_{1}$ and charge $q_{1}$ is enclosed by a spherical shell of radius $r_{2}$ and charge $q_{2} .$ Show that if $q_{1}$ is positive, charge will necessarily flow from the sphere to the shell (when the two are connected by a wire) no matter what the charge $q_{2}$ on the shell is.
$(a)$ 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?
$(a)$ 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?