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Select the correct statements :
I) The average thermal velocity of the electrons in a conductor is zero
      II) Direction of motion of electrons are randomly oriented
     III) If the length of the conductor is doubled, the drift velocity will become half of the original
          value. (keeping potential difference unchanged).

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Only III is correct

All are correct

I and II correct

II and III are correct

answer is D.

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Detailed Solution

We know that in a conductor,

$J = n e V_{d} o r V_{d} = n e A I$

I = RV and $R = ρ I / A$

So, the value of drift velocity becomes $V_{d} = (n e ρ) I V ........ (1)$

From eq.1 we can see V_d is inversely related to length 1 because voltage is given constant.

So, $V_{d} α I$

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