1.

1.A wire of length L and resistance R is stretched so that itslength is doubled and area of cross section is halved. How willits (i) resistance change? (ii) resistivity change?

Answer»

i) The Resistance Will increase by 4ii) There Will be no change in resistivity because resistivity does not depend on leng th and area of cross section.

Resistance=resistivity*length/areahence if length is doubled are area halvedresistance will become 4 timesand resistivity will become 1/4th times



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