Question

The mean drift speed of free electrons in a conductor of radius ris v. If same current flows in a conductor of same material but of radius
2r, the mean drift speed will now be​

Answer 1

Explanation:

from wire 1, A

1

=πD

2

from wire 2, A

2

=4πD

2

the mean drift velocity ∝

area

1

V

drift

∝

Area

1

V

2

V

1

=

A

2

A

1

=

4πD

2

πD

2

V

2

V

1

=

4

1

solution