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### magn_forces_summary

Course: PHYS 208, Spring 2009
School: Texas A&M
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Word Count: 144

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Fields Magnetic and Forces r Magnetic field, B: unit Tesla (T) [N/(A.m)] r Field lines indicate B direction Lines from N poles, toward S. Force on Charge: r r Force on Wire: r r r F = Idl B or IlBsin r F = qv B wire loops: Trajectory: always a circle. Force can be into or out of (cyclotron motion) B-field; see below. qB mv ; = r= qB m Wire loops: r r (1) Dipole moment = , NIA points in right hand...

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Fields Magnetic and Forces r Magnetic field, B: unit Tesla (T) [N/(A.m)] r Field lines indicate B direction Lines from N poles, toward S. Force on Charge: r r Force on Wire: r r r F = Idl B or IlBsin r F = qv B wire loops: Trajectory: always a circle. Force can be into or out of (cyclotron motion) B-field; see below. qB mv ; = r= qB m Wire loops: r r (1) Dipole moment = , NIA points in right hand rule direction. N is number of turns. some atoms have dipoles (e.g. iron atoms) (2) Torque = (NIA)Bsin or Bsin r r aligns with B. r r r vector version: = B (3) Energy r r U = B r r for Magnetism: B dA = 0 Gauss Law means, B field lines are closed loops. No magnetic charges. J. H. Ross, Department of Physics, Texas A&M University
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