Question

When the area of cross-section of a conductor is doubled, its resistance becomes
(a) double
(b) half
(c) four time
(d) one-fourth

Answer 1

$\LARGE\underline{\underline{\sf Answer}}$

$\large\implies{\sf (b)Half}$

$\LARGE\underline{\underline{\sf Explanation:}}$

As we know ,

$\large{\boxed{\sf Resistance (R)=\rho\frac{L}{A} }}$

Here ,

we can see that Resistance is directly proportional to Lenght and Inversely proportional to Cross section Area.

$\large\implies{\sf R\:\:\alpha\:\:\dfrac{1}{2A}}$

•°•

On doubling the Area . Resistance will become half

Answer 2

$\huge{\boxed{\boxed{\mathfrak{\pink{Answer}}}}}$

(b) half