Wire A and Wire B are made of the same metal

PHYSICS · Subjective · A Level · Physics · Electricity · Electricity

Problem

Wire A and Wire B are made of the same metal. Wire A is twice as long as Wire B but also has twice the radius. Which wire has the greater resistance? Explain your choice in one or two sentences.

Related theory

Resistance & Resistivity
Resistance: geometry and temperature dependence
Current Electricity
Resistivity and factors affecting resistance
Factors affecting resistance of a conductor
Electricity
Electric Circuits

Browse the problem library