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A semi-conducting 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)a p-n junction
- b)an intrinsic semiconductor
- c)a p-type semiconductor
- d)an n-type semiconductor
Correct answer is option 'A'. Can you explain this answer?
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A semi-conducting device is connected in a series circuit with a batte...
Explanation:
- A p-n junction is a type of semi-conducting device that allows current to pass through the circuit in one direction only.
- When the polarity of the battery is reversed, the p-n junction acts as a barrier to the flow of current, resulting in a drop to almost zero.
- This behavior is due to the fact that when the p-n junction is forward biased (battery connected in the correct polarity), the majority carriers (electrons or holes) are pushed towards the junction, allowing current to pass through. However, when the p-n junction is reverse biased (battery connected in the opposite polarity), the majority carriers are pulled away from the junction, creating a depletion region that acts as a barrier to the flow of current.
- In contrast, an intrinsic semiconductor (option B) has no p-n junction and behaves as a resistor regardless of the polarity of the battery. Similarly, a p-type or n-type semiconductor (options C and D) may have a p-n junction, but they are biased in the same way regardless of the polarity of the battery.
Therefore, the correct option is A, a p-n junction.
- A p-n junction is a type of semi-conducting device that allows current to pass through the circuit in one direction only.
- When the polarity of the battery is reversed, the p-n junction acts as a barrier to the flow of current, resulting in a drop to almost zero.
- This behavior is due to the fact that when the p-n junction is forward biased (battery connected in the correct polarity), the majority carriers (electrons or holes) are pushed towards the junction, allowing current to pass through. However, when the p-n junction is reverse biased (battery connected in the opposite polarity), the majority carriers are pulled away from the junction, creating a depletion region that acts as a barrier to the flow of current.
- In contrast, an intrinsic semiconductor (option B) has no p-n junction and behaves as a resistor regardless of the polarity of the battery. Similarly, a p-type or n-type semiconductor (options C and D) may have a p-n junction, but they are biased in the same way regardless of the polarity of the battery.
Therefore, the correct option is A, a p-n junction.
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A semi-conducting 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 bea)a p-n junctionb)an intrinsic semiconductorc)a p-type semiconductord)an n-type semiconductorCorrect answer is option 'A'. Can you explain this answer?
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