Question

Five resistances are combined according to the figure. The equivalent resistance between the point X and Y will be

• A. $10\Omega$
• B. $22\Omega$
• C. $20\Omega$
• D. $50\Omega$

Answer 1

The correct option is A $10\Omega$

(a)

The equivalent circuit of above can be drawn as
Which is a balanced wheatstone bridge.
So current through AB is zero.
So $\frac{1}{R}=\frac{1}{20}+\frac{1}{20}=\frac{1}{10}\Rightarrow R=10\Omega$