Question

. The electrical resistivity of a copper wire of length 0.1 km and radius 0.5 mm is 1.7 x 10-8 Ωm . The

electrical resistivity of the same wire when its length is doubled and area of cross section is half will be

( Given: R= 2.16Ω)


tell the answer pls​

Answer 1

Explanation:

We know that

R = PL/A

IF LENGTH IS DOUBLED AND AREA BECOMES HALF THEN,

R = P (2L) /A/2

R = 4PL/A

THAT MEANS

Rnew = 4 times the initial one

put the values and get the answer.