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प्रश्न
When electrons drift in a metal from lower to higher potential, does it mean that all the free electrons of the metal are moving in the same direction?
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उत्तर
No, when electric field applied the electrons will have net drift from lower to higher field but locally electrons may collide with ions and may change its direction of motion.
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संबंधित प्रश्न
Derive an expression for drift velocity of free electrons.
On the basis of electron drift, derive an expression for resistivity of a conductor in terms of number density of free electrons and relaxation time. On what factors does resistivity of a conductor depend?
Why alloys like constantan and manganin are used for making standard resistors?
The relaxation time τ is nearly independent of applied E field whereas it changes significantly with temperature T. First fact is (in part) responsible for Ohm’s law whereas the second fact leads to variation of ρ with temperature. Elaborate why?
What is the average velocity acquired by free electrons in a conductor under the influence of an electric field called?
What is the average time interval between two successive collisions of a free electron with the ions of the metallic lattice called?
What is the average velocity of electrons when no electric field is present?
What is the net current in a conductor in the absence of an electric field?
Which expression gives the acceleration of an electron in an electric field?
What is the microscopic expression for conductivity?
