A-LevelPhysicsElectricity9702/12 · Feb/Mar 2020 · Q341 Mark
A manufacturer recommends that the longer the extension cord you use with an electric drill, the bigger the cross-sectional area of the cord should be. What is a reason for this recommendation?
AResistance is inversely proportional to both the length and the cross-sectional area.
BResistance is inversely proportional to the length and directly proportional to the
cross-sectional area.
CResistance is proportional to both the length and the cross-sectional area.
DResistance is proportional to the length and inversely proportional to the cross-sectional
area.
✓ Correct answer
D: Resistance is proportional to the length and inversely proportional to the cross-sectional area.
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