The resistance of a wire is $$R$$ ohm. If it is melted and stretched to $$n$$ times its original length, its new resistance will be:
1. $$nR$$
2. $$\frac{R}{n}$$
3. $$n^2R$$
4. $$\frac{R}{n^2}$$

Subtopic: Â Derivation of Ohm's Law |
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NEET - 2017
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Two solid conductors are made up of the same material and have the same length and the same resistance. One of them has a circular cross-section of area ${A}_{1}$ and the other one has a square cross-section of area ${A}_{2}$. The ratio ${A}_{1}/{A}_{2}$ is:

 1 $$1.5$$ 2 $$1$$ 3 $$0.8$$ 4 $$2$$
Subtopic: Â Derivation of Ohm's Law |
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NEET - 2020
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The dependence of resistivity $$(\rho)$$ on the temperature $$(T)$$ of a semiconductor is, roughly, represented by:

 1 2 3 4
Subtopic: Â Derivation of Ohm's Law |
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