Question

An infinite ladder is constructed with 1 Ω and 2 Ω resistor shown below. The current I flowing through the circuit is ___________

(a) 8.18 A

(b) 0 A

(c) 9 A

(d) 10 A

Answer 1

Right answer is (c) 9 A

The best explanation: Equivalent Resistance, REQ = R = 1 + (2 || R)

Or, REQ = 2

So, I = \(\frac{18}{2}\) A = 9 A.