*Question E6A10:
In Figure E6-1, which is the schematic symbol for an N-channel dual-gate MOSFET?*  

*Correct Answer is  B: 4*  

### AI Response: (may contain errors)  

In the context of the Extra Class exam, understanding schematic symbols is crucial for identifying components in circuit diagrams. 

### Correct Answer: 4
- The correct answer is **4** because it represents the schematic symbol for an N-channel dual-gate MOSFET. This symbol typically includes:
  - Two gates (indicating dual-gate functionality)
  - A source and a drain, with the source connected to the lower potential side.

### Why the Other Choices are Incorrect:
- **Choice A: 2**
  - This symbol does not represent a dual-gate MOSFET. It may represent a different type of transistor or component.
  
- **Choice B: 4**
  - This is actually the correct answer, so it cannot be incorrect. 

- **Choice C: 5**
  - This symbol likely represents a different type of MOSFET or a different component entirely, such as a P-channel MOSFET or a single-gate device.

- **Choice D: 6**
  - This symbol does not correspond to an N-channel dual-gate MOSFET and may represent another type of transistor or electronic component.

### Useful Tips:
- **Identifying MOSFETs:**
  - Look for the number of gates in the symbol. Dual-gate MOSFETs will have two gate connections.
  - N-channel MOSFETs typically have an arrow pointing out of the source terminal, indicating the direction of conventional current flow.

By familiarizing yourself with these symbols and their characteristics, you can improve your ability to interpret circuit diagrams effectively for the exam.