(b) An electron gun is composed of hollowed anode and cathode discs. These discs are used to accelerate electron when a

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B An Electron Gun Is Composed Of Hollowed Anode And Cathode Discs These Discs Are Used To Accelerate Electron When A 1 (288.71 KiB) Viewed 26 times

(b) An electron gun is composed of hollowed anode and cathode discs. These discs are used to accelerate electron when a high voltage is applied as shown in Figure 1. (1) Using equation of electric field produced by a surface charge density ps show that E at location (0, 0, a) due to a disk charge centered at origin (disc axis is in z- direction) radius a ≤ p≤ 2a is expressed by Ps √5 -√2 az 28 √10 € (111) E(0,0, a) - Calculate the force experienced by an electron charge of -2 nC at (0, 0, a), where a=0.5 and p= 2 C/m². Calculate the surface charge density ps,2 of a second disc (similar size to the first disc) when it is placed at z = 1 and the force experienced by the -2 nC charge (Question 1 b (ii)) is doubled. 2a Electron a Cathode Figure 1 Anode ▸y