Two wires of same material and identical lengths are joined in parallel to a battery of constant voltage. If the radius of cross section of both the wires are in the ratio of 3:5 then the ratio of dri

Question

Two wires of same material and identical lengths are joined in parallel to a battery of constant voltage. If the radius of cross section of both the wires are in the ratio of 3:5 then the ratio of drift speed of electrons in the wire is given by :

TestHub · Accepted Answer

Same material, same length and same battery voltage: the field $E = V / L$ is identical in both wires.

Drift speed $v_{d} = \frac{e E τ}{m}$ depends on E and the material only, not on the wire's thickness, so the ratio is 1:1 - none of (A), (B), (C).

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