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a wire of length l and a resistance r is streached so that length is double and area of cross section halved. how will (a) resistance change, (b) resistivity change |
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Answer» The resistance will be 4 TIMES i.e. 4r and resistivity will be same. Explanation: R∝l R∝1/A so l is DOUBLED and A is halved, then R will be 4 times. Resistivity is constant that DEPENDS on material of wire that does not changed hence resistivity not chnged |
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