A "free" electron and a "free" proton are placed in an identical electric field. Which of the following statements are true? (Select all that apply.)  - The electric force on the proton is equal in magnitude to the electric force on the electron, but in the opposite direction. - The electric force on the proton is greater in magnitude than the electric force on the electron, but in the opposite direction. - Both particles have the same acceleration. -  Each particle is acted upon by the same electric force and has the same acceleration.  - The magnitude of the acceleration of the electron is greater than that of the proton.

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