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A uniform Electric field is directed parallel to and in the direction of the positive x-axis.

A proton is placed some where in the x y plane.

Since, a proton is positively charged, the force on it due to the field \vec{E} will be in the direction parallel to x - axis  , from the point where the proton is placed.

       \vec{Force} = q\ \vec{E} = e\ E\ \hat{i}

   e = q = electric charge of a proton
   So direction of Force is same as the direction of electric field.

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