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Give the basic construction of pentode
Ans:
Construction of Pentode: Constructional details of a typical pentode are demonstrated in fig. (a) and fig. (b) Pentode comprise five electrodes namely a cathode, three grids (suppressor grid, control grid, screen grid) and a plate. Grid closest to the cathode is control grid, next is the screen grid and third is the suppressor grid. Suppressor grid is generally coarser than the control grid or even screen grid mesh and is placed very close to the plate. It doesn't obstruct the flow of electrons from cathodes to anode (or plate). To keep the control grid-to-plate capacitance small extra shields are provided either within the glass envelope or external to it. In latter case the bulb is so shaped as to allow the shield to come very near to plate.
What is waveguide dispersion in optical fibres? Waveguide dispersion (Δτ w ): Waveguide dispersion occurs because of the dependence onto the velocity of propagation of every
state Biot sevart law.
A 240-turn solenoid having a length of 21 cm and a diameter of 8.8 cm carries a current of 0.44A. Calculate the magnitude of the magnetic field inside the solenoid.
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limitation of electrostatic sheilding
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