The current in a copper wire is increased by increasing the potential difference between its ends. Which one of the following statements regarding n, the number of charge carriers per unit volume in the wire and vd, the drift velocity of the charge carriers is correct?

Question

The current in a copper wire is increased by increasing the potential difference between its ends. Which one of the following statements regarding n, the number of charge carriers per unit volume in the wire and vd, the drift velocity of the charge carriers is correct? (A) n is unaltered but vd is decreased (B) n is unaltered but vd is increased (C) n is increased but vd is decreased (D) n is increased but vd is unaltered

Tardigrade Admin · Accepted Answer

n the number density, depends on the atomic structure of the material. (V/R)=I=n e A ⋅ vd As V increases, I increases, vd increases.

Q. The current in a copper wire is increased by increasing the potential difference between its ends. Which one of the following statements regarding $n$ , the number of charge carriers per unit volume in the wire and $v_{d}$ , the drift velocity of the charge carriers is correct?

$n$ is unaltered but $v_{d}$ is decreased

$n$ is unaltered but $v_{d}$ is increased

$n$ is increased but $v_{d}$ is decreased

$n$ is increased but $v_{d}$ is unaltered

$n$ the number density, depends on the atomic structure of the material.
$\frac{V}{R} = I = n e A \cdot v_{d}$
As $V$ increases, $I$ increases, $v_{d}$ increases.

Q. The current in a copper wire is increased by increasing the potential difference between its ends. Which one of the following statements regarding n, the number of charge carriers per unit volume in the wire and vd​, the drift velocity of the charge carriers is correct?

n is unaltered but vd​ is decreased

n is unaltered but vd​ is increased

n is increased but vd​ is decreased

n is increased but vd​ is unaltered