A horizontal beam of electrons initially moving at 42 107


A horizontal beam of electrons initially moving at 4.2 107 m/s is deflected vertically by the vertical electric field between oppositely charged parallel plates as shown in the diagram. The magnitude of the field is 1.90 104 N/C.

(a) What is the direction of the field between the plates?

up

down

right

left

(b) What is the charge per unit area on the plates?

C/m2

(c) What is the vertical deflection d of the electrons as they leave the plates?

mm

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Physics: A horizontal beam of electrons initially moving at 42 107
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