Question

8- A wire of resistivity "r" is stretched to double its length How does it affect the
a) resistance b) resistivity​

Answer 1

Answer:

a) Resistance will be doubled

b) Resistivity will be halved

Explanation:

a) R = Pl

A

R = Pl*2

A

R = 2 times the original resistance

b) P = RA

l

P = RA

l*2

P = Half the original resistivity.