Question

A potential difference v is applied across the ends of a copper wire length and diameter .What is the effect on drift velocity

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

Drift velocity = v_drift = I / (neA) = J/(ne)  =  V/(neA R) = V/(neρl)

     I = current     n = num of electrons per unit volume (constant for copper

     e = electron charge      A = area of cross section = π D²/4

      R = resistance of wire      ρ = resistivity         l = length of wire

Thus, 

i)  When V is doubled, drift velocity is doubled.

2) l is doubled then velocity is halved , if V remains same.

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