Question
Write two points of difference between intrinsic and extrinsic semiconductors.
✓
Answer
| Intrinsic | Extrinsic | ||
| i. | Pure semiconductor. | i. | Doped or impure. |
| ii. | 𝑛𝑒 = 𝑛ℎ. | ii. | 𝑛𝑒 ≠ 𝑛ℎ. |
| iii. | Low conductivity at room temperature. | iii. | Higher conductivity at room temperature. |
| iv. | Conductivity depends on temperature. | iv. | Conductivity does not dependm significantly on temperature. |
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c. Explain carefully why the derivation as in (b) is not valid for magnetic field in a plane normal to a currentcarrying straight wire of finite length and passing through the midpoint of the axis.