Question

The resistance of a wire is R If the diameter of the wire le halved by stretching
it then the resistance of the wire will become
(A) 2 R
(B) 4R
16 R
(C) 8 R​

Answer 1

Answer:

hi this is your answer

Explanation:

Length (l) is doubled & Area of cross section (A) is halved.

l becomes 2l & A becomes

2

A

R=P

A

L

now take l=2l,A=

2

A

R=

A/2

P2l

=4P

A

L

⇒4R

Resistance becomes 4 times

1) Resistivity does not depend on its length 02 Area.

Hence, it does not change.