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Factors Affecting Resistance & How They Affect

Certain wire ...

Question

Certain wire has resistance of 10 Ohm. If it is stretched by 1/10th of its length, then its resistance is nearly:

A

9 Ω

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B

10 Ω

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C

11 Ω

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D

12 Ω

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Solution

The correct option is D
12 Ω

As R = ρ $\frac{L}{A}$ and Volume = L x A = Constant

Final Resistance = ${1.1}^{2}$ R = 1.21R = 12.1 Ω

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