Question:medium

How is \(v_d\) affected when the length of the conductor is doubled, keeping the voltage applied across the conductor constant?

Show Hint

Be careful! Look at what is constant. - If Current (\(I\)) is constant, doubling length does *not* change \(v_d\) (since \(I = neAv_d\)). - If Voltage (\(V\)) is constant, doubling length halves the electric field (\(E = V/L\)), which explicitly halves the drift velocity (\(v_d \propto E\)). Always identify the constant parameter first!

Updated On: Jul 2, 2026

Show Solution

Solution and Explanation

Was this answer helpful?

0

Top Questions on Drift Velocity

Questions Asked in CBSE Class XII exam

The role of a catalyst is to change _____________ .

CBSE Class XII - 2025
Surface Chemistry

Which of the following statements is true for the function \[ f(x) = \begin{cases} x^2 + 3, & x \neq 0, \\ 1, & x = 0? \end{cases} \]

CBSE Class XII - 2024
Functions

\( \int_a^b f(x) \, dx \) is equal to:

CBSE Class XII - 2024
Functions

Let \( \theta \) be the angle between two unit vectors \( \mathbf{\hat{a}} \) and \( \mathbf{\hat{b}} \) such that \( \sin \theta = \frac{3}{5} \). Then, \( \mathbf{\hat{a}} \cdot \mathbf{\hat{b}} \) is equal to:

CBSE Class XII - 2024
Vector Algebra