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Solution


Q.

The value of net resistance of the network as shown in the given figure is                   [2024]
1 (5/2)Ω  
2 (30/11)Ω  
3 (15/4)Ω  
4 6Ω  

Ans.

(4)

Diode 2 is in reverse bias, so current will not flow in branch of 2nd diode, So we can assume it to be broken wire.
Diode 1 is in forward bias, so it will behave like conducting wire. The circuit is equivalent to

Req=15×1015+10=15×1025=6Ω