A potential difference V is applied across a conductor of length l and uniform cross-section area A. How will the (i) electric field E, (ii) drift velocity vd, and (iii) current density j be affected when (a) V is doubled and (b) l is halved (keeping other factors constant) ?

Question

TextElectric Field and Its DefinitionDrift Velocity of Electrons in a ConductorCBSE 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

Two charged particles P and Q, having the same charge but different masses mP and mQ, start from rest and travel equal distances in a uniform electric field E in time tP and tQ respectively. Neglecting the effect of gravity, the ratio tP/tQ is :

MCQ (Single)

Motion of Charged Particle in Uniform Magnetic Field