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A wire of length I and resistance R is streched so that length is doubled and the areaof cross-section is halved How will its :(i) resistance change ?(ii) resistivity change ?answer fastly |
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Answer» Explanation: 1.Here, length is doubled and area of cross-section is halved. Thus, a WIRE of length l and area of cross-section A BECOMES a wire of length 2l and area of cross-section A/2 2.Resistivity of a substance does not DEPEND on its length or area of cross-section. It depends on the nature of the material and temperature. HENCE there is no change |
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