Is it aside from first part #2 being false, are rest of the answers true? Explan

Question

Is it aside from first part #2 being false, are rest of the answers true? Explanations please.

Consider a proton moving parallel to a positively charged rod at rest, as shown below. (Imagine that the rod is very, very long.) Rod Proton (+ 7 First consider the "reference frame" in which the rod is at rest (this frame is used in the diagram above) and answer the following questions: 1. The rod creates an electric field in this frame. True or False? 2. The rod creates a magnetic field in this frame. True or False? 3. The proton feels an electric force in this frame. True or False? 4. The proton feels a magnetic force in this frame. True or False? Now imagine you are sitting on the proton- to you it looks like the rod is moving. (This is called the "rest frame" of the proton.) Answer the following questions 1. The rod creates an electric field in this frame. True or False? 2. The rod creates a magnetic field in this frame. True or False? 3. The proton feels an electric force in this frame. True or False? 4. The proton feels a magnetic force in this frame. True or False?

Explanation / Answer

The rod does create an electric field in this frame. So first part #1 is true. The rod creates an electric field because, there are positive charges spread out in it. But the rod doesn't create any magnetic field in this frame. When a charge is in motion it creates a magnetic field. It's the proton that creates a magnetic field around it since it's in motion. And the proton will feel an electric force in this frame. But it won't feel a magnetic force in this frame of reference. Because the magnetic force will occur due to the proton and in proton's frame of reference.

Hope this helps.

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