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Physics
Physics
Problem
Which of the following expressions gives the conductivity
σ
\sigma
σ
of a conductor in terms of the free-electron number density
n
n
n
, elementary charge
e
e
e
, and mobility
μ
\mu
μ
? a)
n
e
μ
2
\dfrac{n e \mu}{2}
2
n
e
μ
b)
2
n
e
μ
2\, n e \mu
2
n
e
μ
c)
n
e
μ
n e \mu
n
e
μ
d)
n
e
μ
2
\dfrac{n e \mu}{\sqrt{2}}
2
n
e
μ
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