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Mean Free Path of Electrons

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Advanced Knowledge of Drift Velocity

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Dift Velocity of Electrons in Conductor

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Important Questions

Drive an expression for drift velocity of free electrons in a conductor.

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The electric field E, current density J and conductivity of a conductor are related as

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Which of the following characteristics of electrons determines the current in a conductor?

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Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area  carrying a current of . Assume that each copper atom contributes roughly one conduction electron. The density of copper is  and its atomic mass is .

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Drift velocity varies with the intensity of electric field as per the relation

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When a potential difference  is applied across a conductor at a temperature  the drift velocity of electrons is proportional to

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Explain the term 'drift velocity' of electrons in a conductor. Hence obtain the expression for the current through a conductor in terms of 'drift velocity'.

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A steady current flows in a metallic conductor of non-uniform cross-section. Which of the following quantities is constant along the conductor?

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Drift speed of electrons, when of current flows in a copper wire of cross section , is . If the electron density in copper is the value of in is close to (Take charge of electron to be )

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Two conducting wires X and Y of same diameter but different materials are joined in series  across a battery. If the number density of electrons in X is twice that in Y, find the ratio of drift velocity of electrons in the two wires

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