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All the elements in the circuit shown in the following figure are ideal. Which of the following statements is/are true?
When switch 
is 
, both 
and 
conducts and 
is reverse biased.
When switch is 
conducts and both and are reverse biased.
When switch is OFF, is reverse biased and both and conduct.
When switch is OFF, conducts, is reverse biased and conducts.
When S is ON, diode D3 gets reverse biased
Assume D1 is ON & D2 is OFF
I1 = 4A > 0 ∴D1 is ON
VD2 = -20 V < 0 ∴D2 is OFF
∴ Option (b) is correct
When S is OFF, D3 is ON due to 2A current source Assume D1 is OFF & D2 is ON
ID2 = 4A > 0 ∴ D2 is ON
VD1 = 20 – 40 = -20 < 0 ∴D1 is OFF
∴ Option (c) is correct