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Standard XII
Physics
Current Density Vector
Define 'drift...
Question
Define 'drift velocity' of free electrons.
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Solution
It is defined as the average velocity with which free electrons get drifted towards the positive end of a conductor (opposite to the electric field) under the influence of an external electric field.
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Define relaxation time of the free electrons drifting in a conductor: How is it related to the drift velocity of free electrons? Use this relation to deduce the expression for the electrical resistivity of the material.
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