Two 4.0 cm -diameter disks face each other 1.5 mm apart., Ask an Expert

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Two 4.0 cm -diameter disks face each other, 1.5 mm apart. They are charged to +/- 13 nC. 1) What is the electric field strength between the disks? 2)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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