The electric resistance of a particular wire of iron is R. If its length and radius are doubled, then:
1. | The resistance will be halved and the specific resistance will remain unchanged |
2. | The resistance will be halved and the specific resistance will be doubled |
3. | The resistance and the specific resistance, will both remain unchanged |
4. | The resistance will be doubled and the specific resistance will be halved |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyResistances \(n\), each of \(r\) ohm, when connected in parallel give an equivalent resistance of \(R\) ohm. If these resistances were connected in series, the combination would have resistance in ohms, equal to:
1. \(\dfrac{R}{n^2}\)
2. \(\dfrac{R}{n}\)
3. \(nR\)
4. \(n^2R\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhen a wire of uniform cross-section a, length l, and resistance R is bent into a complete circle, the resistance between any two diametrically opposite points will be:
1. R/2
2. R/4
3. R/8
4. 4R
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology