Question 381: Current Electricity

Question

Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross section 5 mm
2
, is $$\upsilon $$. If the electron density in copper is 9 $$ 	imes $$ 10
28
/m
3
the value of $$\upsilon $$. in mm/s is close to (Take charge of electron to be = 1.6 $$ 	imes $$ 10
$$-$$19
C)

Accepted Answer

We know,
I = neAV
d
$$ 	herefore $$   V
d
= $${{m I} \over {neA}}$$
=   $${{1.5} \over {9 	imes {{10}^{28}} 	imes 1.6{ 	imes ^{ - 19}} 	imes 5 	imes {{10}^{ - 6}}}}$$
=   0.02 m/s

Answer

0.02

Answer

3

Answer

2

Answer

0.2

Current Electricity

Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross section 5 mm 2 , is $\upsilon . If the electron density in copper is 9 \times 10 28 /m 3 the value of \upsilon . in mm/s is close to (Take charge of electron to be = 1.6 \times 10 -$19 C)

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