Electronics and Communication Engineering - Exam Questions Papers - Discussion
Discussion Forum : Exam Questions Papers - Exam Paper 7 (Q.No. 45)
45.
In a infinite ladder circuit as shown above each resistance of r Ω then find RAB
∞
1.61r
none of the above
Answer: Option
Explanation:
Let RAB = R
Since ladder is infinite we can assume RCD = R
∴ R = r + (r || R) = 
∴ 
∴ Rr + R2 = r2 + 2rR
R = 1.61r or - 0.615r
R cannot be negative
∴ R = 1.61r.
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