The value of net resistance of the network as shown in the given figure is :
(A)(25)Ω
(B)(415)Ω
(C)6Ω✓ Correct
(D)(1130)Ω
Answer: (C)
Solution
Check the diodes with the given node potentials (−6 V and −8 V). Diode 2 is reverse-biased, so its branch (the 5Ω path) carries no current and is removed. Diode 1 is forward-biased and acts as a plain wire.
The circuit then reduces to the 15Ω and 10Ω resistors in parallel:
Req=15+1015×10=25150=6Ω.
Option C.
JEE Main · 2024 · 04 Apr 2024 · Shift 1 · Single correct option