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Find the equivalent resistance between terminals A and B obtained in the equivalent Nortan’s circuit.

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Find the equivalent resistance between terminals A and B obtained in the equivalent Nortan’s circuit.

(a) 8

(b) 9

(c) 10

(d) 11

I got this question by my college director while I was bunking the class.

My doubt is from Norton’s Theorem in section Useful Theorems in Circuit Analysis of Network Theory

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The correct choice is (b) 9

The explanation is: The resistance at terminals AB is the parallel combination of the 10Ω resistor and the 6Ω resistor and parallel combination of the 15Ω resistor and the 8Ω resistor => R=(10×6)/(10+6)+(15×8)/(15+8)=8.96≅9Ω.

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