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Physics
Physics
Problem
Which expression gives the resistance
R
R
R
of a uniform cylindrical conductor that has length
l
l
l
, cross-sectional area
A
A
A
, and resistivity
ρ
\rho
ρ
? a)
R
=
ρ
l
R=\dfrac{\rho}{l}
R
=
l
ρ
b)
R
=
ρ
l
A
R=\dfrac{\rho\,l}{A}
R
=
A
ρ
l
c)
R
=
ρ
A
l
3
R=\dfrac{\rho\,A}{l^{3}}
R
=
l
3
ρ
A
d)
R
=
ρ
l
3
A
2
R=\dfrac{\rho\,l^{3}}{A^{2}}
R
=
A
2
ρ
l
3
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