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A student has a resistance wire of 1 ohm. If the length of this wire is 50 cm, he stretches
it uniformly so as to obtain a wire of 4 ohm resistance. What is the change in its
resistivity ? Justify your answer.
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If the length of this wire is 50 cm, to what length he should stretch it uniformly so as to obtain a wire of 42 resistance? Justify your answer. (ans l=100 cm) lindrical conner conductors along with their face areas.
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