Transistor input characteristics curves are the graphs drawn with

Options

A. Collector current `I_C` on y-axis and the collector emitter voltage `V_(CE)` on X-axis for a constant base current
B. Base current `I_B ` on y-axis and the base-emitter voltage `V_(BE)` on X-axis for a constant collector emitter voltage
C. Base current `I_B` on y-axis and the collector emitter voltage `(V_(CB))` on x-axis for a constant collector current
D. Base current `I_B ` on y-axis and collector current `I_C` on x-axis with constant base emitter voltage

Answer

To solve the question regarding the transistor input characteristics curves, we need to analyze the options provided and determine which one correctly describes the input characteristics of a transistor.

### Step-by-Step Solution:

1. **Understanding Input Characteristics**:
- The input characteristics of a transistor refer to the relationship between the base current (IB) and the base-emitter voltage (VBE) while keeping the collector-emitter voltage (VCE) constant.

2. **Analyzing the Options**:
- **Option 1**: Collector current (IC) on y-axis and collector-emitter voltage (VCE) on x-axis for a constant base current.
- This describes output characteristics, not input characteristics.
- **Option 2**: Base current (IB) on y-axis and base-emitter voltage (VBE) on x-axis for a constant collector-emitter voltage (VCE).
- This matches the definition of input characteristics.
- **Option 3**: Base current (IB) on y-axis and collector-emitter voltage (VCE) on x-axis for a constant collector current (IC).
- This does not represent input characteristics.
- **Option 4**: Base current (IB) on y-axis and collector current (IC) on x-axis with constant base-emitter voltage (VBE).
- This is also not an input characteristic.

3. **Identifying the Correct Answer**:
- From the analysis, **Option 2** is the correct answer as it correctly describes the input characteristics of a transistor.

### Final Answer:
**Transistor input characteristics curves are the graphs drawn with base current (IB) on the y-axis and base-emitter voltage (VBE) on the x-axis for a constant collector-emitter voltage (VCE).** Therefore, the correct option is **Option 2**.