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

[binhbinh]

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.

 

[berkeman]

>fixed charge of -60j x 10^-9C at point X

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

 

[binhbinh]

up, anyone?