Question

Equivalent resistance between the points $A$ and $B$ is (in $\Omega$)

• A. $\frac{1}{5}$
• B. $\frac{5}{4}$
• C. $\frac{7}{3}$
• D. $\frac{7}{2}$

Answer 1

The correct option is C $\frac{7}{3}$

The points in the circuit is marked as shown below:


In circuit, resistance between $PQ,QR$ and $RS$ are in parallel.
Now circuit reduces to


All the three resistances are in series combination:

$\therefore R_{AB}=1+1+\frac{1}{3}=\frac{7}{3}\Omega$