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The electric resistance of a certain wire of iron is R If its length and...

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The electric resistance of a certain wire of iron is R If its length and radius are both doubled then 1 The resistance will be doubled and the specific resistance will be halved 2 The resistance will be halved and the specific resistance will remain unchanged 3 The resistance will be halved and the specific resistance will be doubled 4 The resistance and the specific resistance will both remain unchanged 1 2 3 4

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