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JEE MainPhysicsCurrent Electricity

A battery of emf 25 V and internal resistance 1 is connected across two terminals A and B of a resistor network. A 20 resistor is connected directly between A and B. From terminal A, a 2 resistor connects to a node C. A 6 resistor connects node C to terminal B. From node C, a 4 resistor connects to a node D. A 3 resistor connects node D to terminal B. From node D, a 6 resistor connects to a node E. An 8 resistor conn

Correct answer

16

Step-by-step solution

The thick conducting wire connects node E directly to terminal B, short-circuiting the 8 resistor. Thus, node E is at the same potential as terminal B. The 6 resistor (between D and E) is now effectively connected between D and B. This places it in parallel with the 3 resistor (also between D and B). Equivalent resistance between D and B: R_ DB = 3 6 3 + 6 = 2 . This 2 equivalent is in series with the 4 resistor (between C and D), making the resistance of the branch C-D-B equal to 4 + 2 = 6 . This 6 branch is in pa

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