Which of the following is true in case of a forward biased p-n junctio...
The diode is forward biased, positive is connected to p & vice-versa, as such batter provides EMF to drive electrons from n-region to p-region.
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Which of the following is true in case of a forward biased p-n junctio...
**Explanation:**
A forward biased p-n junction diode is a diode in which the positive terminal of the battery is connected to the p-side (anode) and the negative terminal of the battery is connected to the n-side (cathode) of the diode.
When a forward voltage is applied to a p-n junction diode, the following processes occur:
**1. Formation of the depletion region:**
- Initially, the p-n junction diode is in the unbiased state, where there is no external voltage applied.
- In this state, the p-side is positively charged due to the presence of holes (positive charge carriers), and the n-side is negatively charged due to the presence of electrons (negative charge carriers).
- The diffusion of charge carriers across the junction creates a region called the depletion region, which lacks any free charge carriers.
**2. Forward biasing:**
- When a positive voltage is applied to the p-side of the diode and a negative voltage is applied to the n-side, the diode is said to be forward biased.
- This forward bias reduces the width of the depletion region, allowing free charge carriers to move across the junction.
**3. Electron flow:**
- In a forward biased p-n junction diode, the positive terminal of the battery is connected to the p-side (anode) of the diode.
- The positive terminal attracts the negatively charged electrons from the n-side of the diode.
- These electrons move through the external circuit, creating a current flow.
**4. Hole flow:**
- As the electrons move from the n-side to the p-side, they leave behind positively charged holes in the n-side.
- These holes are attracted by the positive terminal of the battery and move towards it.
- The movement of holes through the p-side constitutes a flow of positive charges, creating a current flow in the opposite direction.
Therefore, in a forward biased p-n junction diode, the positive terminal of the battery sucks electrons from the p-region (anode). This is because the positive terminal attracts the negatively charged electrons, allowing them to flow through the external circuit.
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