alleryA wire is made twice as long, with the same material and thickness. What happens to its resistance?
AIt halves
BIt doubles
CIt is unchanged
DIt becomes zero
Answer & Solution
Correct answer: B. It doubles
1. Resistance is proportional to length.
2. Doubling the length doubles the resistance, so halving or no change is wrong.
3. Zero would mean no resistance at all.
_Source: Wikipedia, Electrical conductor, Resistance and conductance_
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