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What is meant by drift speed of free ele...

What is meant by drift speed of free electrons ?

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Drift speed : It is defined as the average velocity gained by the free electrons of a conductor in the opposite direction of the externally applied electric field.
It is given by,
`vec(v_d)=-(evecEtau)/m`
where, `tau` is the relaxation time, E is the applied electric field and m is the mass of the electron.
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