Parallel Plate Capacitors Video Lessons

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Problem: Two 2.0-cm-diameter disks face each other, 1.0 mm apart. They are charged to ±10 nC.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?

FREE Expert Solution

Electric field,

E=Qε0A

A=πr2

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Problem Details

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. They are charged to ±10 nC.

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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