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The mass of a copper wire of resistance R1 and length l1 is four times the mass of another copper wire of length l2 and resistance R2. If R1 = R2, which one of the following is correct ?

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The mass of a copper wire of resistance R<sub>1 </sub>and length l<sub>1 </sub>is four times the mass of another copper wire of length l<sub>2 </sub>and resistance R<sub>2</sub>. If R<sub>1 </sub>= R<sub>2</sub>, which one of the following is correct ?






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