A proton is observed to be moving with a...

A proton is observed to be moving with a constant velocity through a region of space. If E and B represent the electric and magnetic field respectively. This region of space may have

E=0 ,B=0

E=0 , B`ne0`

`Ene0` , B=0

`Ene0 , Bne0`

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A, B, D

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