Question

A current of 10A is maintained in a conductor of cross section 10^-4 m². if the number density of free electrons be 9× 10²⁸ m^-3 calculate the drift velocity of free electrons. given that charge on electrons = 1.6× 10^-19 C.​

Answer 1

1.94× 10

−3

m/s

The relation between current and drift velocity

I.e1=V

d

.e.n.a

where I= current

V

d

= current velocity

e= electron

n= no. of electrons per unit volume

a= area of cross section

Now, V

d

=

nea

I

=

1×10

−4

×9×10

7

×28

10

=1.94×10

−3

m/s