Estimate the approximate maximum deflection of the electron beam near the center of a CRT television screen due to the Earth s 5.0 × 10 –5 T field. Assume the screen is 18 cm from the electron gun, where the electrons are accelerated ( a ) by 2.0 k V, or ( b ) by 28 kV. Note that in color TV sets, the beam must be directed accurately to within less than 1 mm in order to strike the correct phosphor. Because the Earth’s field is significant here, mu-metal shields are used to reduce the Earth’s field in the CRT. (See Section 23–9.)
Estimate the approximate maximum deflection of the electron beam near the center of a CRT television screen due to the Earth s 5.0 × 10 –5 T field. Assume the screen is 18 cm from the electron gun, where the electrons are accelerated ( a ) by 2.0 k V, or ( b ) by 28 kV. Note that in color TV sets, the beam must be directed accurately to within less than 1 mm in order to strike the correct phosphor. Because the Earth’s field is significant here, mu-metal shields are used to reduce the Earth’s field in the CRT. (See Section 23–9.)
Estimate the approximate maximum deflection of the electron beam near the center of a CRT television screen due to the Earth s 5.0 × 10–5 T field. Assume the screen is 18 cm from the electron gun, where the electrons are accelerated (a) by 2.0 k V, or (b) by 28 kV. Note that in color TV sets, the beam must be directed accurately to within less than 1 mm in order to strike the correct phosphor. Because the Earth’s field is significant here, mu-metal shields are used to reduce the Earth’s field in the CRT. (See Section 23–9.)
A charged particle moves through a velocity selector at constant velocity. In the selector, E = 1.0×104 N/C and B = 0.250 T. When the electric field is turned off, the charged particle travels in a circular path of radius 3.33 mm. Determine the charge-to-mass ratio of the particle.
A beam of electrons traveling horizontally with an initial
speed of v, =
3.0 x 10' m/s enters a uniform, vertically
upward electric field with magnitude E = 2.0 × 10* N/C
between the deflection plates of an oscilloscope, as shown
in the figure. The initial velocity of the electrons is
perpendicular to the field. The plates are d = 4.0 cm long.
Ignoring all forces apart from the electrostatic interactions,
calculate the magnitude and direction of the velocity of the
electrons after passing though the plates.
%3D
eling
orizontally with an
speed of v; = 3.0 × 10' m/s enters a uniform, vertically
upward electric field with magnitude E = 2.0 × 10* N/C
between the deflection plates of an oscilloscope, as shown
in the figure. The initial velocity of the electrons is
perpendicular to the field. The plates are d = 4.0 cm long.
Ignoring all forces apart from the electrostatic interactions,
calculate the magnitude and direction of the velocity of the
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d
oloctrons ofter nossing thouch the plotes
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