1.

When the length and area of cross-section both are doubled, then its resistanceA. unchangedB. halvedC. doubledD. quadrupled

Answer» Correct Answer - a
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.


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