Current Electricity

Question

When plate voltage in diode valve is increased from 100V to 150V. Then, plate increases from 7.5 mA to 12 mA, then dynamic plate resistance will be

10 kΩ

11 kΩ

15 kΩ

11.1 kΩ

Solution

11.1 kΩ

Plate resistance = $\frac{∆ V_{P_{2}} - ∆ V_{P_{1}}}{∆ i_{p_{2}} - ∆ i_{p_{1}}}$