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A resistor is stretched twice its …

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A resistor is stretched twice its length ,how does its resistance and specific resistance change

Posted by Mohit Sepat 7 years, 2 months ago

CBSE > Class 12 > Physics

7 answers

Mohit Sepat 7 years, 2 months ago

Thanku

G K 7 years, 2 months ago

Resistance=£L/A.....£= resistivity, L=length, A=area of cross-section......there is no current in this formula...?

G K 7 years, 2 months ago

Its not current mohit....its area of cross -section of wire after it is stretched twice.....

Mohit Sepat 7 years, 2 months ago

Aapne current 0.5A kyu liya

G K 7 years, 2 months ago

Let £ = resistivity , R = resistance , R' = new resistance , A = area , A' = new area , L = length.....wire ko 2 time stretch kiya h, therefore L' = 2L....volume is same in both case.....therefore A×L=A'×L'....A×L=A'×2L....A'=A/2.... R'=£(2L)/0.5A....R'=4£L/A...R'=4R..... £(resistivity) doesn't change as it is property of material.....

Mohit Sepat 7 years, 2 months ago

How u can say this give reason

Anjana Sherawat 7 years, 2 months ago

I think resistance becomes 4 times but resistivity remain unaffected

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