Question

In the network shown below, the ring has zero resistance.
The equivalent resistance between the point A and B is
(a) 2R
(b) 4R
(c) 7R R
(d) 10R

Answer 1

Answer:

see below for full explanation

Explanation:

As the ring has no resistance, the three resistances 3R are in parallel.

The equivalent resistance for parallel combination is R  

P

​  

=(1/3R+1/3R+1/3R)  

−1

=R

Now R  

P

​  

 and R are in series in between A and B so equivalent resistance is  

R  

AB

​  

=R  

P

​  

+R=R+R=2R