A potential difference (V) is applied across a conductor of length 'L' and cross-sectional area 'A'. How will the drift velocity of electrons and the current density be affected if another identical conductor of the same material were connected in series with the first conductor ? Justify your answers.

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TextDrift Velocity of Electrons in a ConductorRelation Between Current and Drift VelocityCBSE PYQ

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Define 'current density'. Is it a scalar or a vector ? An electric field E is maintained in a metallic conductor. If n be the number of electrons (mass m, charge – e) per unit volume in the conductor and τ its relaxation time, show that the current density j = αE, where α = (ne²/m)τ.

TextDrift Velocity of Electrons in a ConductorRelation Between Current and Drift Velocity

Electrons drift with speed vd in a conductor with potential difference V across its ends. If V is reduced to V/2, their drift speed will become :

MCQ (Single)