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A proton enters the top plate of a parallel capacitor via a small opening and accelerates...

A proton enters the top plate of a parallel capacitor via a small opening and accelerates towards the bottom plate. The proton’s entry speed is1.20×10^4 m/s. The separation of the plates is 10cm and the proton reaches the lower plate in 1.0 μs. What is the magnitude of the electric field in the capacitor?

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