When the length and area of cross-section both are doubled, then its resistance

Options

A. unchanged
B. halved
C. doubled
D. quadrupled

Answer

a

Explanation

Initial length of the conductor
`I_(1)=I`
Find leght of the conductor
Initial cross-sectional area `A_(1)=A`
Final cross-sectional area `A_(2)=2A`
The resistance of conductors given by
`R=rho(I)/(A) prop (I)/(A)`
As both the length and area doubled Hence, there will be no change in the resistance of the conductor and so it will remain unchanged.