Lecture%209%202220%20Spring%202009

Lecture%209%202220%20Spring%202009 - Physics 2220...

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1 Physics 2220 Announcements: HW 6 is due Friday HW 7 is due next Tuesday Exam 1 is a week from next Monday Help room (Physics 117) hours Help room (Physics 117) hours: Monday 4-8 pm Tuesday and Wednesday 3-6:30 pm Thursday 4:30-8 pm Friday 2-6 pm Turn in a piece of paper with name and responses if you don’t have your clicker with you today, or if you haven’t given me your clicker ID yet Example A hollow spherical conducting shell of inner radius a and outer radius b carries a net charge Q . A point charge q is located at the center of the hollow. Find the electric potential in the region a) r > b , b) a < r < b , and c) r < a . Applications: Van de Graaff Generator • Charge is delivered continuously to a high-potential electrode by means of a moving belt of insulating material The high voltage electrode is a hollow The high-voltage electrode is a hollow metal dome mounted on an insulated column • Ions accelerated through such large potentials receive enough energy to initiate nuclear reactions
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Lecture%209%202220%20Spring%202009 - Physics 2220...

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