Electromagnetic fields and waves

Electromagnetic fields and waves - Physics 113 Electricity...

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Physics 102: Lecture 15, Slide 1 Physics 113 Electricity and Magnetism Lecture16: Electromagnetic Fields and Waves (Knight: 34.1 to 34.5) Physics 113 Dr. Renat Letfullin
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Physics 102: Lecture 15, Slide 2 Electric and magnetic Fields 2 2 0 0 1 1 ˆ , away from 4 4 q q E r q r r πε πε = = r 0 0 2 2 ˆ sin , to and by RHR 4 4 qv r qv B v r r r μ μ θ π π × = = r r r r Physics 113 Dr. Renat Letfullin
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Physics 102: Lecture 15, Slide 3 Field Lines Any Field lines never cross. Field line spacing indicates field strength. weak strong Magnetic Field lines form closed loops only when there is a current or a flux change in the other field (i.e., energy flow). Electric Field lines start and stop on charges (if any). Q -Q Physics 113 Dr. Renat Letfullin
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Physics 102: Lecture 15, Slide 4 Gauss’s Law Revisited 0 in e Q E dA ε Φ = = r r Ñ 0 m B dA Φ = = r r Ñ (magnetic monopoles go here) Physics 113 Dr. Renat Letfullin 0 through B ds I μ = r r Ñ Ampere’s Law
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Physics 102: Lecture 15, Slide 5
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