Which of the following expressions gives the conductivity of a conductor in terms of…

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Problem

Which of the following expressions gives the conductivity

\sigma

of a conductor in terms of the free-electron number density

n

, elementary charge

e

, and mobility

\mu

? (a)

\dfrac{n e \mu}{2}

(b)

2\, n e \mu

(c)

n e \mu

(d)

\dfrac{n e \mu}{\sqrt{2}}