alleryIf a wire's cross-section area doubles, its resistance does what?
AIt doubles
BIt stays same
CIt quadruples
DIt is halved
Answer & Solution
Correct answer: D. It is halved
1. Resistance is inversely proportional to cross-sectional area.
2. Doubling the area halves the resistance; doubling or quadrupling are wrong.
3. It does not stay the same.
_Source: Wikipedia, Electrical conductor, Resistance and conductance_
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