Question

What would be the new resistance and resistivity of a circular conducting wire if its:
(a) Length is tripled
(b) Length becomes one-third of original.
(c) Cross-sectional area is doubled
(d) cross-sectional area is halved​

Answer 1

Answer:

b

Explanation:

because it has to be more dienicity

Answer 2

(a) If length is tripled, l' = 3l

New resistance,

 

(b) If length becomes one-third of original, l' = l/3

New resistance,

 

(c) If area of cross section is doubled, A' = 2 A

New resistance,

 

(d) If area of cross section is halved, A' = A/2

New resistance,

 

Resistivity is property of a material. It always remains the same always