Cathode-ray tubes (CRTs) are often found in oscilloscopes and computer monitors.

Question

Cathode-ray tubes (CRTs) are often found in oscilloscopes and computer monitors. In the figure(Figure 1) an electron with an initial speed of 6.70

Cathode-ray tubes (CRTs) are often found in oscilloscopes and computer monitors. In the figure(Figure 1) an electron with an initial speed of 6.70times106m/s is projected along the axis midway between the deflection plates of a cathode-ray tube. The potential difference between the two plates is 23.0V and the lower plate is the one at higher potential.

Explanation / Answer

Ans:- electric field = V/d = (23/2)*100 = 1150 V/m

a). F = q.E = -(1.6*10^-19).1150 = -1.84 * 10^-16 N

b). downward .

c). F = m.a

1.84 * 10^-16 = 9.11*10^-31 * a

a = - 2* 10^14 j

d). downward

5). dx = v.dt

dt = (2*10^-2)/(6.7*10^6) = 3 ns

s = ut+ a.t^2/2

s = (a/2).t^2 = (2*10^14/2)*(3 *10^-9)^2 = 0.9 mm

6). angle = tan^-1(Vy/Vx)

Vy = Vo + ay.t =

Vx = 6.7 * 10^6 m/s

evaluate and find answer

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