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Forward and Reverse Biasing | Additional Study Material for JEE PDF Download
(i) No current flows in the junction diode without an external battery. It is connected to a battery in two different ways. Hence two different bias are possible in junction diode.
(a) Forward bias
(b) Reverse bias
| S.No. | Forward bias | Reverse bias |
| 1. | The P-region of Junction diode Is connected to positive terminal of battery and N-region is connected to negative terminal of battery.
| The P-region Is connected to negative terminal and N-region is connected to positive terminal of the battery.
|
| 2. | In this the width of depletion layer decreases
| In this the width of depletion layer increases
|
| 3. | Current flows in it due to majority electrons and majority holes and hence high current (mA) flows in it.
The direction of current in it is from P to N. | Current flows in it due to minority electrons and minority holes and hence negligible current (in μA) flows in it.
Direction of current s from N to P |
| 4. | The junction resistance is low | The junction resistance is high |
| 5. | Curve between forward voltage and forward current
| Curve between reverse voltage and reverse current
|
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FAQs on Forward and Reverse Biasing - Additional Study Material for JEE
| 1. What is forward biasing in the context of JEE? |  |
Ans. Forward biasing in the context of JEE refers to the process of applying a voltage in the forward direction to a p-n junction diode. This allows electric current to flow easily through the diode, as it reduces the width of the depletion region and increases the flow of majority charge carriers.
| 2. How does forward biasing affect the behavior of a diode? | |
Ans. Forward biasing alters the behavior of a diode by decreasing the resistance of the p-n junction. This leads to an increase in the current flow through the diode, making it conductive. The diode allows the current to flow from the anode (P-side) to the cathode (N-side) when forward biased.
| 3. What is reverse biasing and its significance in JEE? | |
Ans. Reverse biasing is the process of applying a voltage in the reverse direction to a p-n junction diode. This increases the width of the depletion region, preventing the flow of current through the diode. In JEE, understanding reverse biasing is important as it helps in analyzing the characteristics and behavior of diodes under different biasing conditions.
| 4. How does reverse biasing affect the behavior of a diode? | |
Ans. Reverse biasing alters the behavior of a diode by increasing the resistance of the p-n junction. This prevents the flow of majority charge carriers across the diode, creating a high resistance barrier. As a result, very little current flows through the diode when reverse biased.
| 5. What are the applications of forward and reverse biasing in electronic circuits? | |
Ans. Forward and reverse biasing have various applications in electronic circuits. Forward biasing is commonly used in rectifier circuits, where it allows the conversion of alternating current (AC) to direct current (DC). Reverse biasing is utilized in diode-based voltage regulators and photodiodes, which convert light energy into electrical signals. Additionally, reverse biasing is used in diode-based switches and detectors.
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