Consider two copper wires with the same cross-sectional area. Wire A is twice as long as wire B. How do the resistivities and resistances of the two wires compare?

Check all that apply.
Wire A and wire B have the same resistance.
Wire A has twice the resistivity of wire B.
Wire B has twice the resistance of wire A.
Wire A has twice the resistance of wire B.
Wire A and wire B have the same resistivity.
Wire B has twice the resistivity of wire A.

Question

Consider two copper wires with the same cross-sectional area. Wire A is twice as long as wire B. How do the resistivities and resistances of the two wires compare?

Check all that apply.
	 Wire A and wire B have the same resistance.
	 Wire A has twice the resistivity of wire B.
	 Wire B has twice the resistance of wire A.
	 Wire A has twice the resistance of wire B.
	 Wire A and wire B have the same resistivity.
	 Wire B has twice the resistivity of wire A.

anonymous · Answer

Resistivity is a property of the material itself, so wires of the same material will have the same resistivities.

Resistance = (resistivity) (length)/(cross-sectional area)

anonymous · Answer

So the resistivity is the same for A and B and the resistance for A is longer?

***[isuru]*** · Answer

yes... since one Cu wire is longer than the other.. the longer one will have higher resistance...
 and u can understand it by the equation douglas has given :)

anonymous · Answer

thank you very much!

***[isuru]*** · Answer

u r welcome!