Question

Find resistance between a & b... ​

Answer 1

Answer:

r

Explanation:

In AC 2r || 2r , equivalent = r

In BC r and r in series , equivalent = 2r

Again, In CD r || r, equivalent = r/2

Next, In BC 2r || 2r ,equivalent = r

the circuit is now a balanced Wheatstone bridge. so no current will go through CD

In ACB r and r in series, equivalent = 2r

In ADB r and r in series, equivalent = 2r

Then 2r || 2r ,equivalent = r