Question

The equivalent resistance between the terminals $A$ and $D$ in the following circuit is

• A. $10\Omega$
• B. $20\Omega$
• C. $5\Omega$
• D. $30\Omega$

Answer 1

Answer: (B)

The effective circuit is shown in the figure.

The resistance of arm $EHG=10\Omega +10\Omega =20\Omega ,$
will be parallel to resistance of arm
$EFG=10\Omega +10\Omega =20\Omega$.
Their effective resistance $=\frac{20\Omega \times 20\Omega }{20\Omega +20\Omega }=10\Omega$
Therefore, the equivalent resistance between $A$ and $D$
$=5\Omega +10\Omega +5\Omega =20\Omega$