Question

a wire of length L and area of cross section a was drawn into a wire of double its length by melting it if its original Resistivity and resistance where p and R respectively what will be its new Resistivity and resistance​

Answer 1

Answer:

When a wire is doubled by melting, its length would become double and area of cross-section would be halved i.e., length of wire = 21 and area of cross-section = A / 2

Where R1 is the new resistance.

Therefore, the new resistance of the wire is 4 R. As resistivity of a material is the characteristic of a given material, hence it remains unchanged.

Answer 2

pls see the image mate hope you get the answer