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NTA Abhyas JEE Main2020PhysicsCurrent ElectricityPractice

The resistance of each straight section is r = 2 Ω . Find the equivalent resistance (in ohms) between A and B .

Correct answer

7

Step-by-step solution

The circuit can be simplified as shown in the above figure. Due to symmetry, we can see that the distribution of current at point A in the circuit, is the same as the recombination of the current before point B. Also, the junction which is present between the points C and D can be disconnected because it won't affect the distribution of current.   r AB = r + 1.5 r + r ⇒ r AB = 3.5 r = 7   Ω

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