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Unformatted text preview: Problem solving: Magnetic fields – things to remember 1. The magnetic force is perpendicular to the magnetic field direction. 2. The righthand rule (or screw rule) is useful for determining directions. 3. Equations in this chapter give magnitudes only. The righthand rule gives the direction. Mass spectrometer If a charged particle moves through perpendicular E and B fields , there is a particular speed where the electric and magnetic forces balance and it will not be deflected: Fe=Fb qE=qvB so v=E/B All the atoms reaching the second magnetic field will have the same speed . Their radius of curvature, r in the second field will depend on their mass, m . F=ma qvB=mv2/r m=qBB’r/E Flux?? The induced emf in a closed loop is proportional to the rate of change of magnetic flux, φ B through the loop. [Faraday’s Law] The current produced by an induced emf moves in a direction so that its magnetic field opposes the original change in flux. [Lenz’s Law] Problem Solving using Lenz’s Law...
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This note was uploaded on 03/30/2008 for the course PHYSICS 112 taught by Professor Fretwell during the Spring '08 term at Iowa State.
 Spring '08
 Fretwell
 Physics, Force

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