Question

a) The drift velocity of electrons in a conducting wire carrying current I is v. If the radius of
the wire is doubles and current is 2I, then the new drift velocity is
1)v/4
ii) V/2
iii)v
iv)4v​

Answer 1

Answer:

v/4

Explanation:

If current is kept constant then we can see that drift velocity is inversely proportional to area of cross-section of wire. Hence inversely proportional to square of radius of wire , which means that doubling the radius of wire will decrease the drift velocity by a factor of four.