4. A piece of wire is redrawn by pulling it until its length is double

1.	4. A piece of wire is redrawn by pulling it until its length is doubled. What will be theeffect on its resistivity and resistance? Give reason.
Answer» Explanation: Previous condition, R =Resisitivity l/A Now, L=2l A=A/2 because length is INVERSELY proportional to A. New R =Resistivity2l/A/2=4(Resistivity*L/A) Thus, resistance inreased four TIMES . Resistivity is CONSTANT until and UNLESS temrature changes

4. A piece of wire is redrawn by pulling it until its length is doubled. What will be theeffect on its resistivity and resistance? Give reason.

Answer»

Explanation:

Previous condition,

R =Resisitivity *l/A

Now, L=2l

A=A/2 because length is INVERSELY proportional to A.

New R =Resistivity*2l/A/2=4(Resistivity*L/A)

Thus, resistance inreased four TIMES .

Resistivity is CONSTANT until and UNLESS temrature changes

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4. A piece of wire is redrawn by pulling it until its length is doubled. What will be theeffect on its resistivity and resistance? Give reason.​

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4. A piece of wire is redrawn by pulling it until its length is doubled. What will be theeffect on its resistivity and resistance? Give reason.