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The resistivity does not change if

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The material is changed

The temperature is changed

The shape of the resistor is changed

Both the material and temperature are changed

answer is C.

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Detailed Solution

The resistivity does not change if the shape of the resistor changed.
Resistivity is the resistance of a conductor of unit length(

l

) and having a cross-section area(

A

) of

1 m^{2}

. The relation between the resistance(

R

) and resistivity(

ρ

) is formulated as,

ρ = R \frac{A}{l}

Resistivity depends on the temperature and the nature of the material and the temperature but does not depend on the shape of the resistor. It is resistance that changes with the shape of the respective resistance.

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