Two solid conductors are made up of same material have same length and same resistance . One of them has circular crosssection of area `A_1` and other one has square cross section of area `A_2`. RATIO `A_1/A_2`

Options

A. 1
B. 0.8
C. 2
D. 1.5

Answer

A

Explanation

Resistance `(R )=(rhol)/(A)`
`R prop (l)/(A)`
`:.R_(1)A_(1)=R_(2)A_(2)`
`:.(A_(1))/(A_(2))=(R_(2))/(R_(1))=1 ( :.R_(2)=R_(1))`