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Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectric Current through Gases

A triode operates within the linear region of its characteristics. If the plate voltage is subjected to a slight increase, the dynamic plate resistance will

Options

  1. Aincrease
  2. Bdecrease
  3. Cbecome zero
  4. Dremain almost the same

Correct answer

D. remain almost the same

Step-by-step solution

In the linear region of the characteristics of a triode, the plate current I_p varies linearly with the plate voltage V_p at a constant grid voltage V_g . The dynamic plate resistance is defined as r_p = ( V_p I_p )_ V_g = constant . Since the graph of I_p versus V_p is a straight line in the linear region, its slope I_p V_p is constant. Therefore, the dynamic plate resistance r_p remains almost the same when the plate voltage is slightly increased.

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