Question

Two conducting wires X and Y of same diameter but different materials are joined in series across a battery. If the number density of electrons in X is twice that in Y, find the ratio of drift velocity of electrons in the two wires.

Answer 1

In series current is same,

So, I_A = I_B = I = neAvd

For same diameter, cross - sectional area is same

A_A = A_B = A

∴ I_A = I_B

\(\Rightarrow\) n_xeAv_x = n_yeAv_y

Given n_x = 2n_y