Which of the following expressions gives the electrical resistance of a uniform…

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

Which of the following expressions gives the electrical resistance

R

of a uniform cylindrical wire in terms of its resistivity

\rho

, length

l

, and radius

r

? (a)

R=\dfrac{\rho l}{r^{2}}

(b)

R=\dfrac{\rho l}{\pi r^{2}}

(c)

R=\dfrac{\rho l}{2\pi r^{2}}

(d)

R=\dfrac{2\rho l}{\pi r^{2}}

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