In figure, assuming the diodes to be ideal
A
is forward biased and 
is reverse biased and hence current flows from A to B.
B
is forward biased and 
is reverse biased and hence no current flows from B to A and vice verse
C
and 
are both forward biased and hence current flows from A to B
D
and 
are both reverse biased and hence no current flows from A to B and vice versa.
Text Solution
Verified by ExpertsThe correct answer is:
B
Diode 
is reverse biased as p side is connected to negative potential and n side to ground.
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