Physics

Problem

Drift speed of electrons, when

1.5 \text{ A}

of current flows in a copper wire of cross section

5 \text{ mm}^2

, is

v

. If the electron density in copper is

9 \times 10^{28} \text{ m}^{-3}

the value of

v

\text{mm/s}

close to (Take charge of electron to be

= 1.6 \times 10^{-19} \text{ C}

) a.

0.02

3

2

0.2