resistivity of given copper wire of 2 m is 1.7*10^-8 ohm m the wire is stretched so that new length becomes 4m. find the new resistivity of copper wire
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Resistivity (Specific resistance) is Specific to material of the wire. It’s independent of dimensions of wire.
∴ Resisitivity remains same.
∴ Resisitivity remains same.
Anshumandey19:
wrong resistivity or specific resistance per unit length of the conductor
it depends upon the length
When you say “per unit length” it clearly means it is independent of length of the wire. Try to understand the definitions which you’ve memorised.
that is resistance not resistivity
resistance depends upon resistivity
well you should first read and then answer
resistance is the obstruction offered by the material of the conductor to the flow of current this type of resistance is called external resistance
but the obstruction offered by the electrolytes and electrodes
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