Question

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

• A. 10 Ω
• B. 22 Ω
• C. 20 Ω
• D. 50 Ω

Answer 1

Answer: (A)

10 Ω

Answer 2

The equivalent circuit of above can be drawn as

Which is a balanced wheatstone bridge. So current through AB is zero.

So $\frac{1}{R} = \frac{1}{20} + \frac{1}{20} = \frac{1}{10}$ ⇒ R = 10 Ω