Intrinsic semiconductor is electrically neutral. Extrinsic semiconductor having large number of current carriers would be

Options

A. positively charged
B. negatively charged
C. positively charged or negatively charged depending upon the type of impurity that has been added
D. electrically neutral

Answer

To solve the question regarding the electrical neutrality of intrinsic and extrinsic semiconductors, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Intrinsic Semiconductors**:
- An intrinsic semiconductor is a pure semiconductor without any significant dopant atoms present. It is electrically neutral because the number of positive charge carriers (holes) equals the number of negative charge carriers (electrons).

2. **Understanding Extrinsic Semiconductors**:
- An extrinsic semiconductor is created by doping an intrinsic semiconductor with impurities. This process introduces additional charge carriers into the material.

3. **Types of Extrinsic Semiconductors**:
- There are two types of extrinsic semiconductors:
- **N-type**: Doped with pentavalent impurities (like phosphorus), which provide extra electrons, increasing the number of negative charge carriers.
- **P-type**: Doped with trivalent impurities (like boron), which create holes, increasing the number of positive charge carriers.

4. **Electrical Neutrality in Extrinsic Semiconductors**:
- Despite the introduction of additional charge carriers, an extrinsic semiconductor remains electrically neutral overall. This is because the number of added charge carriers (either electrons or holes) is balanced by the fixed positive charges of the ionized dopants.

5. **Conclusion**:
- Therefore, even though extrinsic semiconductors have a large number of current carriers (either electrons in N-type or holes in P-type), they are still electrically neutral as the total positive and negative charges balance each other out.

### Final Answer:
The correct answer is that extrinsic semiconductors, despite having a large number of current carriers, are electrically neutral.