Question

Find equivalent resistance between A and B

Answer 1

Equivalent resistance between Nodes A and B is 7R/8.

there are 5 diagrams of the circuit. The circuit is successively reduced by combining parallel or series resistances.

1. Redraw circuit with A on the left and B on the right.
2. Identify symmetry in nodes wrt both input and output ie., A and B.
The are C and E.
3. Merge the nodes C and E.
4. Add series resistances. Find Req for parallel ones.
5. Finally find Resistance ( equivalent) between A and B

see the diagrams : 2 pictures.

Answer 2

We can find the equivalent resistance by using Kirchoff's voltage and current laws.

See the diagrams.

Req between A and B = 7R/8.