Question

The effective resistance between points $A$ and $B$ is

• A. $10\Omega$
• B. $20\Omega$
• C. $40\Omega$
• D. none of the above three values

Answer 1

Answer: (A)

It is a balanced wheatstone bridge, so central resistance can be short circuited. So circuit becomes,

$R_{eq}=\frac{20\times 20}{20+20}=10\Omega$.