The mutual conductance of a triode value is `2.5 millimho`. Find the change in the plate current if the grid voltage is changed from `-2.0 V` to `4.5 V`.

Explanation

To solve the problem of finding the change in plate current when the grid voltage of a triode valve is changed, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Given Values**:
- Mutual conductance, \( g_m = 2.5 \, \text{milli mho} = 2.5 \times 10^{-3} \, \text{mho} \)
- Initial grid voltage, \( V_{g1} = -2.0 \, \text{V} \)
- Final grid voltage, \( V_{g2} = 4.5 \, \text{V} \)
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