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From the following diode circuits, which diode is in forward biased condition :
A
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B
- 
C
- 
D
- 
Detailed Solution
A diode is forward biased when its p-side (anode) is at a higher potential than its n-side (cathode).
Anode 0 V, cathode $-2$ V: $0 \gt -2$, forward biased.
Anode 0 V, cathode $+2$ V: anode is lower, reverse biased.
Anode $-5$ V, cathode $-2$ V: $-5 \lt -2$, reverse biased.
Anode $+5$ V, cathode $+12$ V: $5 \lt 12$, reverse biased.
So the diode with anode at 0 V and cathode at $-2$ V is forward biased.
Anode 0 V, cathode $-2$ V: $0 \gt -2$, forward biased.
Anode 0 V, cathode $+2$ V: anode is lower, reverse biased.
Anode $-5$ V, cathode $-2$ V: $-5 \lt -2$, reverse biased.
Anode $+5$ V, cathode $+12$ V: $5 \lt 12$, reverse biased.
So the diode with anode at 0 V and cathode at $-2$ V is forward biased.