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Two 1.7 cmcm -diameter disks face each other, 2.3 mmmm apart. They are charged to ±20nC....

Two 1.7 cmcm -diameter disks face each other, 2.3 mmmm apart. They are charged to ±20nC.

a) What is the electric field strength between the disks?

b) A proton is shot from the negative disk toward the positive disk. What launch speed must the proton have to just barely reach the positive disk?

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