Unformatted text preview: electric potential energy U of the system? (Take the zero of PE as all three charges infinitely apart). 23.5 A small metal sphere with net (negative) charge q_1 is fixed. A second small metal sphere with a net (negative) charge q_2 is projected toward q_1. When the two spheres are d apart, q_2 is moving toward q_1 with speed v. Treat the two spheres as point charges; ignore gravity. (A) What is the speed of q_2 when the spheres are d' apart? (B) How close do the spheres get? Stopping the Proton An infinitely long line of charge has a linear charge density λ . A proton at distance r _0 from the line is moving directly toward the line with speed v . How close does the proton get to the line of charge? 23.79 Electric charge is distributed uniformly along a thin rod of length a , with total charge Q . Take the potential to be zero at infinity. Find the potential at points R and P . [Here we first do an arbitrary point ( x,y )]....
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- Spring '08
- Charge, Electric charge, Electric potential energy, small metal sphere, positive distance y_1, 23.79 Electric