Suppose you went into your friend’s parents basement to find an old black-and-wh

Question

Suppose you went into your friend’s parents basement to find an old black-and-white TV. The physical setup shows what’s going on inside (and why it’s so big!). There are two low voltage (LV) power supplies at a few volts and one high voltage (HV) at a few kilovolts. The TV is composed of three parts: cathode ray gun, velocity selector, and the fluorescent screen.

1. Velocity selector controls the displacement in the vertical direction y with respect to the no displacement. The two conducting plates at LV creates the electric field in the y direction. (a) (5 cm)2 parallel plates separated by 1 cm are at 3 V . Find Cplates, plates, and E in the middle. (b) Electric field in the y direction is created by the plates. In the absense of any other fields, find the y if the screen is 10 cm away. (Hint: Find the time t, vy after t, then y.) (c)Magnetic field in to the page is created by two coils. For E in (b), find B to achieve y = 0.

2. Projecting an image requires adjusting the parameters of the apparati. (a)Suppose everything is fixed except for E, assume B = 0. Describe the procedure to draw an uppercase letter I (just a line) if it is 1 cm.

Explanation / Answer

Suppose you went into your friend’s parents basement to find an old black-and-wh

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