Question

A wire has resistance of 12ohm . it is bent in a cirle what is the resustance

Answer 1

Hey.

Here is the answer.

as, R = p L/A

so, R is directly proportional to L

so, the ratio of two semicircular parts will be 12/2 ohm or 6 ohm.

Now as the are bent in circle say connected at the diameter apart points

so, they are in parallel connection

1/r = 1/6 + 1/6

or, 1/r = 2/6 = 1/3

Hence, r = 3 ohm.

Thanks.