Question

how does the resistance change the length become
a) 4 time
b) the area is half
c) the length become half
​

Answer 1

Answer:

4 times

Explanation:

because you it is a rectumgulr

Answer 2

Answer:

Resistance of wire is proportional to length and inversely proportional to area.

Area

′

×Length=Volume

⟹Area=

L

V

Volume of wire is always constant.

As length is doubled,

Area×(2L)=V

⟹Area=

2L

V

⇒ Area is halved.

So, R

1

=

A

1

ρL

1

⟹R

2

=

(

2

A

)

ρ(2L)

=

A

4ρL

Resistance of wire increases by four times