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Question

Silicon doped with electron-rich impurity forms ________.

A
ptype semiconductor
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B
ntype semiconductor
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C
intrinsic semiconductor
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D
insulator
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Solution

The correct option is B ntype semiconductor
An N-Type semiconductor is created by adding pentavalent impurities like phosphorus (P), arsenic (As), antimony (Sb), or bismuth (Bi). A pentavalent impurity is called a donor because it is ready to give a free electron to a semiconductor. A pentavalent impurity is electron rich impurity.
So, the correct answer is option B.

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