All questions
AP Physics C: E&M
11.3 Resistance, Resistivity, and Ohm’s Law
IntermediateMCQMathematicalProportional Analysis22.2k
Comparison of radial current flow (left) and axial current flow (right) through a hollow cylinder.
Comparison of radial current flow (left) and axial current flow (right) through a hollow cylinder.
A hollow cylindrical resistor of length \(L\), inner radius \(a\), and outer radius \(b\) is made of a material with uniform resistivity \(\rho\).

In Configuration 1, conducting caps are attached to the inner surface at \(r = a\) and outer surface at \(r = b\), resulting in a radial current flow with resistance \(R_{\text{rad}}\).

In Configuration 2, conducting caps are attached to the flat end faces at \(z = 0\) and \(z = L\), resulting in an axial current flow with resistance \(R_{\text{ax}}\).

What is the ratio \(\dfrac{R_{\text{rad}}}{R_{\text{ax}}}\)?

Log In to Continue

Accounts are free! Log in to try this question, see explanations, save progress, and more!

Tools for a 5