Consider a proton moving parallel to a positively charged infinite thin rod at rest, as shown below.

Proton $\vec{v}$
First consider the frame in which the rod is at rest (the frame assumed in the diagram).
-(g) The proton feels an electric force in that frame.

Question

Consider a proton moving parallel to a positively charged infinite thin rod at rest, as shown below.
  
Proton $\vec{v}$
First consider the frame in which the rod is at rest (the frame assumed in the diagram).
-(g) The proton feels an electric force in that frame.

Quizplus · Accepted Answer

In any frame, a proton, which is a charged particle, will feel an electric force if it is in an electric field or if there are other charged particles present that can interact with it through electromagnetic forces.

Consider a Proton Moving Parallel to a Positively Charged Infinite v⃗\vec{v}v

Consider a Proton Moving Parallel to a Positively Charged Infinite $\vec{v}$