alleryResistance R of a conductor is proportional to:
ALength only (R ∝ l)
BBoth length and 1/area (R = ρl/A)
C1/Area only
DOnly resistivity
Answer & Solution
Correct answer: B. Both length and 1/area (R = ρl/A)
R = ρl/A. So R is directly proportional to length l AND inversely proportional to cross-sectional area A. ρ (resistivity) is the material property.
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