In the diodes shown in the diagrams, which one is reverse biased?
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The Correct Option is C
Solution and Explanation
A diode is reverse biased when the potential at the cathode (n-side) is higher than the potential at the anode (p-side).
(1) The potential at the anode is -12V, and the potential at the cathode is -5V. Since -12V<-5V, the diode is forward biased.
(2) The potential at the anode is 0V, and the potential at the cathode is -10V. Since 0V>-10V, the diode is forward biased.
(3) The potential at the anode is 0V, and the potential at the cathode is +5V. Since 0V<+5V, the diode is reverse biased.
(4) The potential at the anode is +5V, and the potential at the cathode is +10V. Since +5V<+10V, the diode is forward biased. Therefore, the diode in option (3) is reverse biased.
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