Question:
A p-n junction diode acts as a closed switch when it is
A p-n junction diode acts as a closed switch when it is
Show Hint
Remember that forward biasing allows the diode to conduct, making it function like an open switch that has been closed.
Updated On: May 31, 2026
- Forward biased
- Reverse biased
- Unbiased
- Breakdown biased
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Concept
In a p-n junction diode, the behavior changes depending on whether it is forward biased or reverse biased. When forward biased, the diode allows current to flow easily, acting like an open switch that has been closed. Conversely, when reverse biased, the diode blocks current flow effectively.
Step 2: Meaning
Forward biasing means applying a voltage such that the p-side of the diode is at a higher potential than the n-side, allowing electrons to move from the n-side to the p-side through the depletion region. This configuration allows the diode to conduct and act as an open switch that has been closed.
Step 3: Analysis
\[A) Forward biased\] When forward biased, the diode's internal electric field is weakened, allowing current to flow easily. This behavior makes the diode act like a closed switch. \[B) Reverse biased\] In this case, the diode’s internal electric field is strengthened, blocking current flow and acting as an open switch. \[C) Unbiased\] Without any external voltage applied, the diode remains in its initial state where it does not conduct significantly. It neither acts like a closed nor an open switch. \[D) Breakdown biased\] This refers to the breakdown region of the diode’s V-I characteristic curve, which is beyond normal operating conditions and is not typically used for switching purposes.
Step 4: Conclusion
The p-n junction diode acts as a closed switch when it is forward biased because current can flow through it easily under this condition. Final Answer: (A)
Was this answer helpful?
0
0
Top AP EAPCET Physics Questions
- A body is projected from the ground at an angle of $\tan^{-1} \left( \frac{8}{7}\right)$ with the horizontal. The ratio of the maximum height attained by it to its range is
- A lens forms real and virtual images of an object, when the object is at $u_{1}$ and $u_{2}$ distances respectively. If the size of the virtual image is double that of the real image, then the focal length of the lens is (take, the magnification of the real image as $m$ )
- Two spheres $P$ and $Q$, each of mass $200\, g$ are attached to a string of length one metre as shown in the figure. The string and the spheres are then whirled in a horizontal circle about $O$ at a constant angular speed. The ratio of the tension in the string between $P$ and $Q$ to that of between $P$ and $O$ is $(P$ is at mid-point of the line joining $O$ and $Q$ )
- The radii of the two columns in a U - tube are r1 and r2. When a liquid of density p (angle of contact is $ 0{}^\circ $ ) is filled in it, the level difference of the liquid in the two arms is h. The surface tension of the liquid is: (g = acceleration due to gravity)
- A rigid metallic sphere is spinning around its own axis in the absence of external torque. If the temperature is raised, its volume increases by $9 \%$. The change in its angular speed is
View More Questions
Top AP EAPCET applications of diode Questions
- When the voltage applied across a reverse biased p-n junction diode is increased, then the diffusion current
- Consider a transistor amplifier in common emitter configuration. If the current amplification factor, collector resistance and base resistance are increased by 1%, 2% and 1% respectively, then the change in voltage gain is:
Top AP EAPCET Questions
- A body is projected from the ground at an angle of $\tan^{-1} \left( \frac{8}{7}\right)$ with the horizontal. The ratio of the maximum height attained by it to its range is
- The four quantum numbers of the valence electron of potassium are :
- A lens forms real and virtual images of an object, when the object is at $u_{1}$ and $u_{2}$ distances respectively. If the size of the virtual image is double that of the real image, then the focal length of the lens is (take, the magnification of the real image as $m$ )
- Two spheres $P$ and $Q$, each of mass $200\, g$ are attached to a string of length one metre as shown in the figure. The string and the spheres are then whirled in a horizontal circle about $O$ at a constant angular speed. The ratio of the tension in the string between $P$ and $Q$ to that of between $P$ and $O$ is $(P$ is at mid-point of the line joining $O$ and $Q$ )
- The volume of $0.02\, M$ acidified permanganate solution required for complete reaction of $60\, mL$ of $0.01\, MI^{-}$ ion solution to form $I_2$ in $mL$ is
View More Questions