Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectric Current through Gases

For a triode operating in the linear region, the amplification factor is strongly dependent on

Options

  1. Athe temperature of the cathode
  2. Bthe grid potential
  3. Cthe separations of the grid from the cathode and the anode
  4. Dthe plate potential

Correct answer

C. the separations of the grid from the cathode and the anode

Step-by-step solution

The amplification factor of a triode is defined as the ratio of a small change in plate voltage to a small change in grid voltage, keeping the plate current constant. = - ( V_p V_g )_ I_p = constant The value of the amplification factor is primarily determined by the physical construction and geometry of the triode, such as the spacing between the grid wires, the diameter of the grid wires, and the relative distances between the cathode, grid, and anode. It is practically independent of the operating conditions lik

Practice Electric Current through Gases on Quantrex Academy →

More from Electric Current through Gases

A pure tungsten cathode and a thoriated-tungsten cathode share the same geometrical dimensions and are operated at a common temperature. The current produced by the thoriated-tungsDetermine the ratio n(T)/n(1000 K ) for a tungsten emitter at temperatures T = 300 K , 2000 K , and 3000 K . Here, n(T) denotes the number of thermions emitted per second by the suWithin a discharge tube, the mean free path of electrons in the gas is inversely proportional to the internal pressure. The Crookes dark space occupies half the length of the dischAt 2000 K , the saturation current from a thoriated-tungsten cathode is 100 mA . Determine the saturation current for a pure-tungsten cathode that has the same surface area and opeWithin a discharge tube filled with a gas, a molecule undergoes ionization, causing an electron to be detached. An electric field of 5.0 kV m ⁻¹ is present in the region of the eveDetermine the factor by which the emission current changes when the temperature of a tungsten filament is increased from 2000 K to 2010 K . The work function of tungsten is 4.5 eV For tungsten, the constant A in the Richardson–Dushman equation is 60 imes 10^4 A m ⁻² K ⁻² , and its work function is 4.5 eV . An electric heater of 24 W is used to heat a tungsteWhen the plate voltage is 36 V , the power delivered in the plate circuit of a diode is 1.0 W . Determine the power delivered if the plate voltage is raised to 49 V . Assume the La Full Electric Current through Gases list All Concepts Of Physics MCQ Edition [Volume 2] PYQs