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A semiconducting device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be
- a)an intrinsic semiconductor
- b)a p-type semiconductor
- c)a p-n junction
- d)none of these
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
A semiconducting device is connected in a series circuitwith a battery...
Understanding the Circuit Behavior
In the given scenario, the behavior of the current in the circuit changes significantly upon reversing the battery's polarity. This is indicative of a semiconductor device with a specific junction type.
p-n Junction Characteristics
- Structure: A p-n junction is formed by joining p-type and n-type semiconductors.
- Current Flow: When the battery is connected with the correct polarity (forward bias), the junction allows current to flow easily due to the movement of majority charge carriers (holes in p-type and electrons in n-type).
Effect of Reversing Polarity
- Reverse Bias: When the battery's polarity is reversed, the p-n junction is put under reverse bias.
- Barrier Potential: This increases the potential barrier, preventing current flow. Only a negligible reverse saturation current flows, which is nearly zero.
Comparison with Other Semiconductors
- Intrinsic Semiconductors: They do not exhibit this current drop with polarity changes; they conduct under both polarities but are less efficient.
- p-type Semiconductors: They allow current to flow in one direction but do not completely block it when the polarity is reversed.
Conclusion
The significant drop in current upon reversing the polarity strongly suggests that the device in question is a p-n junction. This unique behavior distinguishes it from intrinsic and p-type semiconductors, confirming that the correct answer is option 'C'.
In the given scenario, the behavior of the current in the circuit changes significantly upon reversing the battery's polarity. This is indicative of a semiconductor device with a specific junction type.
p-n Junction Characteristics
- Structure: A p-n junction is formed by joining p-type and n-type semiconductors.
- Current Flow: When the battery is connected with the correct polarity (forward bias), the junction allows current to flow easily due to the movement of majority charge carriers (holes in p-type and electrons in n-type).
Effect of Reversing Polarity
- Reverse Bias: When the battery's polarity is reversed, the p-n junction is put under reverse bias.
- Barrier Potential: This increases the potential barrier, preventing current flow. Only a negligible reverse saturation current flows, which is nearly zero.
Comparison with Other Semiconductors
- Intrinsic Semiconductors: They do not exhibit this current drop with polarity changes; they conduct under both polarities but are less efficient.
- p-type Semiconductors: They allow current to flow in one direction but do not completely block it when the polarity is reversed.
Conclusion
The significant drop in current upon reversing the polarity strongly suggests that the device in question is a p-n junction. This unique behavior distinguishes it from intrinsic and p-type semiconductors, confirming that the correct answer is option 'C'.
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A semiconducting device is connected in a series circuitwith a battery and a resistance. A current is found topass through the circuit. If the polarity of the battery isreversed, the current drops to almost zero. The devicemay bea)an intrinsic semiconductorb)a p-type semiconductorc)a p-n junctiond)none of theseCorrect answer is option 'C'. Can you explain this answer?
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