An n-type semi conductor is:
1. positively charged.
2. negatively charged.
3. neutral (electrically).
4. charged depends upon its biasing.
Which statements is/are correct?

Only 2

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2 and 4

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Only 3

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Only 4

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Solution

The correct option is B Only 3
All the p-type, n-type as well as intrinsic semiconductors are electrically neutral.
Thus statement 3 is correct whereas all the rest statements are incorrect.

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Which of of the given statements are correct regarding clouds during a thunderstorm?

1. Upper parts of the clouds are positively charged.

2. Cloud is electrically neutral (no charge) everywhere.

3. Upper parts of clouds are negatively charged.

4. Lower parts of clouds are negatively charged.

A g N O_{3}

K I

A g I

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