Calculating Proton Speed at Points A and B with Fixed Charge -60 x 10^-9C

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The discussion revolves around calculating the speed of a proton at point B, given a fixed charge of -60 x 10^-9C at point X and the proton's initial speed of 12 x 10^5 m/s at point A. There is confusion regarding the notation of the charge, particularly the mention of an imaginary component (-60j), which raises questions about its meaning in the context of physics. Participants seek clarification on how to approach the calculation and the implications of using imaginary numbers in this scenario. The conversation highlights the need for a clear understanding of electrostatics and motion in electric fields. Overall, the thread emphasizes the importance of accurate charge representation in physics problems.
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Hi,

I'm having troubles with this problem off my lab and I'm wondering if any of you guys could help me with this one.



Suppose you have fixed charge of -60 x 10^-9C at point X. Points A and B are at distances of 0.04 meters and 0.14 meters from X, respectively.

Calculate the speed of point B of a proton that was moving to the right at point A with a speed of 12 x 10^5 m/s.


edit: fixed the problem up, was a typo.
 
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>fixed charge of -60j x 10^-9C at point X

What does that mean? How can charge be an imaginary number? -60jnC?
 
up, anyone?
 
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