Question

Four equal resistors, each of resistance $10\Omega$ are connected as shown in the adjoining circuit diagram. Then the equivalent resistance between points A and B is

• A. $40\Omega$
• B. $20\Omega$
• C. $10\Omega$
• D. $5\Omega$

Answer 1

The correct option is C $10\Omega$

For calculating the equivalent resistance we make the diode short as shown in figure below.
Equivalent resistance, $R_{eq}=\left(\frac{10.10}{10+10}\right)+\left(\frac{10.10}{10+10}\right)=5+5=10\Omega$