11 Questions
What does the variation of resistivity with absolute temperature look like for a copper conductor?
Remaining constant
Select the correct expression for the drift velocity of conduction electrons in a metallic conductor.
vd = eE / τ m
What is the formula for resistivity of a metallic conductor in terms of electron charge (e), electron mass (m), charge carrier density (n), and relaxation time (τ)?
ρ = 2 ne τ
When the current flowing through a conductor is doubled while keeping the area of cross-section double, what happens to the drift velocity?
Remains unchanged at v
How does the drift velocity vary with the intensity of the electric field?
vd ∝ E
What is the mobility of conduction electrons in a metallic conductor with an average relaxation time of $10^{-14}$ sec?
1.78 × $10^{-4}$ m$^2$ V$^{-1}$ s$^{-1}$
Which statement regarding the drift velocity of conduction electrons in a metallic conductor is correct?
Drift velocity is independent of time although free electrons are accelerated.
What is the mobility of conduction electrons in a metallic conductor with a drift velocity of 7.5 × $10^{-4}$ m/s under an electric field of 3 × $10^{-9}$ V/m?
7.5 × $10^{-5}$ m$^2$ V$^{-1}$ s$^{-1}$
In a conductor with a non-uniform cross-section, what can be said about the relationship between drift velocities at points A and B?
$v_A \geq v_B$
What is the average drift velocity of conduction electrons in a conductor with a cross-section area of $1 × 10^{-7}$ m$^2$, carrying a current of 1.5A?
1.1 cm/s
Which factor affects the drift velocity of conduction electrons in a metallic conductor?
Cross-sectional area of the conductor
Test your knowledge on conduction electrons in metallic conductors. Questions cover topics like average relaxation time, mobility, and drift velocity of conduction electrons.
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