Nichrome wire of length L and radius 'R' has resistance of 10Ω. How would the resistance of the wire change when:
Nichrome wire of length L and radius 'R' has resistance of 10Ω. How would the resistance of the wire change when:
(i) Only length of the wire is doubled ?
(ii) Only diameter of the wire is doubled ? Justify your answer.
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(i) R ∝ L
So resistance becomes two times i.e., R = 20 Ω
(ii) R ∝ 1/A ∝ 1/d2
So when the diameter is doubled, resistance becomes one-fourth of the original i.e., R =2.5 Ω
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