The minimum potential difference between the base and emitter required to switch a silicon transistor ON is approximately?

Options

A. 1V
B. 3V
C. 5V
D. 4.2V

Answer

To determine the minimum potential difference between the base and emitter required to switch a silicon transistor ON, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Function of a Transistor**: A silicon transistor operates in different regions, and to switch it ON (forward active region), a certain minimum voltage is required between the base and emitter.

2. **Identify the Cut-off Voltage**: The cut-off voltage is the minimum voltage needed to allow current to flow from the base to the emitter. For silicon transistors, this value is generally around 0.7V to 1V.

3. **Select the Correct Value**: Among the given options:
- Option 1: 1 volt
- Option 2: 3 volts
- Option 3: 5 volts
- Option 4: 4.2 volts

The cut-off voltage for silicon is approximately 1 volt.

4. **Conclusion**: Therefore, the minimum potential difference between the base and emitter required to switch a silicon transistor ON is approximately 1 volt.

### Final Answer:
The minimum potential difference required is **1 volt**.

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