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What will be the change in resistance of...

What will be the change in resistance of a constantan wire when its radius is made half and length reduced to one-fourth of its original length ?

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SL ARORA-CURRENT ELECTRICITY-Problems For Self
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  5. A metallic wire of length 1 m is stretched to duble its length. Calcul...

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  7. Two copper wires A and B of equal masses are taken. The length of A is...

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  8. 1kg piece of copper is drawn into a wire 1mm thick and another piece i...

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  9. A rheostat has 100 turns of a wire of radius 0.4 mm having resistivity...

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  10. Calculate the conductivity of a wire of length 2 m, area of cross-sect...

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  11. What length of a wire of diameter 0.46 mm and specific resistance 50xx...

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  12. The size of a carbon block is 1.0xx10 cm xx50 cm. Find its resistance ...

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  13. Given that resistivity of copper is 1.68xx10^(-8) Omegam. Calculate th...

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  14. A potential difference of 10 V is applied across a conductor of resist...

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  15. A wire of resistance 48 Omega is uniformly stretched until its new len...

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  16. Two wires A and B of the same material have their lengths in the ratio...

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  17. Two wires of the same material have resistances in the ratio 16 : 81 ...

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  18. Two wires of different materials have resistances in the ratio 4 : 3, ...

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  19. A uniform wire is cut into four segments. Each segment is twice as lon...

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  20. The free electrons of a copper wire of cross-sectional area 10^(-6) m^...

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