Question

a wire of length l is made of material resistivity ∫ if cut into half what is material resistivity of each part

Answer 1

Your question is incomplete!

Answer 2

$\huge\mathfrak\pink{Answer !}$

The resistivity of the two parts will be same. If we cut the wire into two equal parts then the length will be change of the wire but will not change the resistivity of the wire. Because resistivity depends upon the material of the wire. Hence, The resistivity of the two parts will be same.

hope it helps

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