physics2 - Problem solving Magnetic fields – things to...

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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 right-hand rule (or screw rule) is useful for determining directions. 3. Equations in this chapter give magnitudes only. The right-hand 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.

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physics2 - Problem solving Magnetic fields – things to...

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