Question

Seven resistances are connected as shown in figure. The equivalent resistance between A and B is

• A. $3\Omega$
• B. $4\Omega$
• C. $4.5\Omega$
• D. $5\Omega$

Answer 1

The correct option is B $4\Omega$


So the circuit is a balanced wheatstone bridge.
So current through $8\Omega$ is zero $R_{eq}=(5+3)\parallel (5+3)=8\parallel 8=4\Omega$