Question

When the current I is flowing through a conductor ,the drift speed is v .If 2i current is flowing through the same metal but having double the area of cross-section,then the drift speed is

Answer 1

Answer:

v

Explanation:

The drift velocity, v

d

=

ne

J

(where, J is current density =

A

i

)

So, v

d

∝j

∴J

1

=

A

i

and J

2

=

2A

2i

=

A

i

=J

1

So, (v

d

)

1

=(v

d

)

2

=v.