A p.d. of V volts is applied to a conductor of length L and diameter D. How will the drift velocity of e's and the resistance of the conductor change when (i) V is doubled (ii) L is halved and (iii) D is halved, where in each case, the other two factors remain same. Give reason in each case.

Question

TextElectrical ResistanceDrift Velocity of Electrons in a ConductorElectrical Resistivity and Conductivity

Similar Questions

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)