Question

A resistor of 20 ohm bent in form circle what is effective resistor between A and B

Answer 1

Hey.

Here is the answer.

The wire is bent into circle so the resistance of each semicircular part will be 20/2 ohm = 10 ohm

{As resistance is directly proportional to L
in R = p L/A }

Now the two resistor of 10 ohm are connected in parallel as A B is dimamete

So, 1/R = 1/10 + 1/10

or, 1/R = 2/10 =1/5

or, R = 5 ohm.

Hence the equivalent resistance is 5 ohm.

Thanks .