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Lecture18 - Physics 42 Lecture 18 Recitation today...

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Physics 42 February 22, 2006 Physics 42 Lecture 18 Recitation today: Assignment 5: problems 10. 11. 12 Assignment 6: problems 1, 2, 6, 11 Quiz 4 on Assignment 5 The Magnetic Force and Field The magnetic force on a point particle Applications Velocity selection Mass selection Particle accelerators The magnetic force on a current Magnetic dipoles
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Physics 42 February 22, 2006 Particle motion in electric and magnetic fields
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Physics 42 February 22, 2006 Given the electric and magnetic fields E and B, the completely general equation for the force on a point particle q is: F q = q E + q v x B This is referred to as the Lorentz equation. The force on an any charged object is obtained by summing (or integrating) over the forces on each point q i (or differential dq ) charge component. The complete EM force The fundamental force law of electromagnetism
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Physics 42 February 22, 2006 Example 1 (velocity selection) How can electric and magnetic fields be used to velocity- select particles?
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