Question

A wire of resistivity rho is stretched to double of its length. What will be its new resistance and resistivity?

Answer 1

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Resistivity is independent of length. .

if u double or triple the length , the resistivity will not change ....

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Answer 2

Answer:

Resistance of the wire will be doubled if its length is doubled as RESISTANCE is directly proportional to LENGTH.

Old Resistance = r

New resistance = 2r

However, Resistivity of a material(wire material) always remains the same and does not change ,no matter what the case.

Thus, Old Resistivity = r

          New Resistivity = r

ps there is a separate symbol for resistivity and it isn't there in my keyboard.

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