My Math Forum Charge in a magnetic field and a electrostatic problem

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 May 1st, 2012, 01:23 PM #1 Newbie   Joined: May 2011 Posts: 5 Thanks: 0 Charge in a magnetic field and a electrostatic problem Hi everyone. This forum been real helpful for the few questions I asked in the past. I hope to be able to help others on here in the future! I have two problems that I could us a little direction on. Any kick starts on where to start would be great. 1) Charge in a magnetic field: A constant line current i flows left to right (+x direction). At a particular instant, an electron is observed to be traveling parallel to the wire (+x direction) with speed v and at a distance d away from the wire. What is the force on the electron (magnitude and direction)? Comment on the subsequent trajectory of the electron: Is it linear, circular, or something else? 2) Electrostatics: Two hollow spherical shells of radius R have a center to center separation of d = 3R. One sphere has charge Q uniformly distributed on its surface and the other has charge –3Q uniformly distributed on its surface. Calculate the potential difference between the centers of the two spheres. Hint: Remember the results for E-field inside and outside uniformly charged spherical shell, and use superposition for total E.

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