QJEEM19Ph496f: JEE Main 2019 Physics - Class 12 JEEM19Ph496f Solution: Drift speed of electrons, when 1.5 A of current flows in a…

Question

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Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross section 5 mm², is

υ

. If the electron density in copper is 9

\times

10²⁸/m³ the value of

υ

. in mm/s is close to (Take charge of electron to be = 1.6

\times

10^{$-$ 19}C)

Accepted Answer

We know,

I = neAV_d

∴

V_d =

\frac{I}{n e A}

=

\frac{1.5}{9 \times 10^{28} \times 1.6 \times^{- 19} \times 5 \times 10^{- 6}}

= 0.02 m/s

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