Posted by **bobby** on Wednesday, April 22, 2009 at 9:46pm.

Two conductors are made of the same material and have the same length. They each have circular cross sectional areas. The ratio of their radii is 2:1. they carry the same current. What is the ratio of the electrical potential across their lengths?

i know that you use R=P(L/A) when your trying to find the cross sectional area. But i don't know what to use when there radii is 2:1

- physics -
**drwls**, Thursday, April 23, 2009 at 8:43am
The larger diameter wide has four times the cross sectional area of the thinner wire, and 1/4 of its resistance.

If they carry the same current I, the voltage drop V = IR is four times higher for the thinner wire.

## Answer This Question

## Related Questions

- Physics - Two wires have the same length and the same resistance but are made up...
- College Physics - Two copper wires have equal cross-sectional areas and lengths ...
- Physics - Two metallic wires of the same material have the same length but cross...
- Physics - An electron and a proton move in circular orbits in a plane ...
- Physics - An electron and a proton move in circular orbits in a plane ...
- Physics - The drawing shows three cylinders that have the same length and cross-...
- physics - there are two wires of same material.their radii and length are both ...
- physics - Two straight conductors are 15 cm apart. If one conductor has a ...
- Statics - A rectangular beam, with cross-sectional width b, height h, Young's ...
- Solid Mechanics - Determine the ratio of strenghts of a solid steel column to ...

More Related Questions