Question: ( 2 0 marks ) In Figure 1 , an electron accelerated from rest through potential difference V 1 = 1 0 0 k V

(20

marks

)

In Figure

1,

an electron accelerated from rest through potential difference

V_{1} = 100 k V

enters the gap between two parallel plates having separation

d = 20.0 m m

and potential difference

V_{2} = 100 V .

The lower plate is at lower potential. Neglect fringing and assume the electron's velocity is perpendicular to to the electric field vector between the plates. In unit vector notation, what uniform magnetic field allows the electron to

Figure

1

travel in a straight line in the gap?

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