How current is formed in conductors ?

1.	How current is formed in conductors ?
Answer» Solution :`rArr` When conductor are subjected to electric field, electric CHARGE experience force. `rArr` If charges are free then they will move and current will be formed. `rArr` In nature free charge exist in UPPER strata of the atmosphere called Ionosphere. `rArr ` In atom and molecules Coulombian force act between electron and nucleus hence electrons are not free. `rArr ` Bulk matter is made up of NWNBER of molecules. `rArr` l gram of water contain about `10^(22)` molecules. These molecules are so closely packed so that individual electron are no longer attached to nucleus. `rArr` In some materials electrons are bound hence even after applying electric field they do not get accelerated. `rArr `In metals some of electrons are practically free to move hence they move randomly in bulk material. `rArr` When external electric field is applied to metals electric current is produced. `rArr` In solid conductors current is formed DUE tomotion of electron. `rArr` In liquid (electrolyte) current is produced due to motion positive and NEGATIVE ion in mutually opposite direction. ` rArr` In gases also current is produced due to motion of ions.

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