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Physics
Physics
Problem
Which of the following gives the resistance
R
R
R
of a uniform conductor of length
L
L
L
and cross-sectional area
A
A
A
in terms of its resistivity
ρ
\rho
ρ
? a)
R
=
ρ
L
R=\dfrac{\rho}{L}
R
=
L
ρ
b)
R
=
2
ρ
L
A
R=2\,\rho\dfrac{L}{A}
R
=
2
ρ
A
L
c)
R
=
ρ
L
A
R=\rho\dfrac{L}{A}
R
=
ρ
A
L
d)
R
=
ρ
L
3
A
2
R=\rho\dfrac{L^{3}}{A^{2}}
R
=
ρ
A
2
L
3
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