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Physics
Physics
Problem
Which of the following expressions gives the resistance
R
R
R
of a uniform cylindrical conductor of length
L
L
L
, cross-sectional area
A
A
A
and resistivity
ρ
\rho
ρ
? a)
R
=
4
ρ
L
A
R = \dfrac{4\rho L}{A}
R
=
A
4
ρ
L
b)
R
=
π
ρ
L
A
R = \dfrac{\pi\rho L}{A}
R
=
A
π
ρ
L
c)
R
=
ρ
L
A
R = \dfrac{\rho L}{A}
R
=
A
ρ
L
d)
R
=
ρ
L
2
A
R = \dfrac{\rho L}{2A}
R
=
2
A
ρ
L
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