ELECTRON MOBILITY || in HINDI

In this Physics video lecture in HINDI for class 12 we explained electron mobility and derived its formula. The electron mobility of a conductor is defined as the drift velocity acquired per unit strength of the electric field applied across the conductor.
So, the electron mobility,
μ = v_d/E
In S.I., its unit is m2 V^-1s^-1.
The equation for drift velocity, we found is e τ / 2m; here, e is the elementary charge, m is the mass of an electron and τ is the average relaxation time for all the free electrons. Hence, we can say that the electron mobility for a material is dependent upon the relaxation time.

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