Question

a piece of wire of resistance 4 ohm is bent through 180 degree at its mid point and two halves are twisted together the resistance now is

Answer 1

Hey.

Here is the answer .

As R = p L/A

so, R is directly proportional to L

As, the wire is bent at mid

so, L = L/2

so, R = 2 ohm each

As, they are twisted together

so, they are in parallel connection

1/r = 1/2 + 1/2

or, 1/r = 1/1

or, r = 1 ohm

Thanks .