A straight wire of length and cross-sectional area has electron number density and…

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Electric Circuits · Electric Circuits

Problem

A straight wire of length

2.0\,\text{m}

and cross-sectional area

0.5\,\text{mm}^2

has electron number density

9\times10^{28}\,\text{m}^{-3}

and electron mobility

3.5\times10^{-3}\,\text{m}^2\text{V}^{-1}\text{s}^{-1}

. What current will flow when a potential difference of

10\,\text{V}

is applied across its ends? (a)

12.6\,\text{A}

(b)

252\,\text{A}

(c)

1.26\,\text{A}

(d)

126\,\text{A}