Question

When the length and area of cross-section both

are doubled, then its resistance

(a) Will be come half

(b) will be doubled

(c) will remain the same

(d) will become four times​

Answer 1

Answer:

Correct option is

C

Will remain the same

Resistance of the wire R=ρ

A

L

Given; L

′

=2L and A

′

=2A

∴ New resistance R

′

=

A

′

ρL

′

=ρ

2A

2L

=R

Thus its resistance will remain the same.

It will stay as it is there would be no change as u r increasing the length as well as the area of cross section that's why they will cancel out each other and there would be no change in the resistance of the wire.

Answer 2

Explanation:

The correct answer is option C ( will remain the same )

And explanation is in the attachment