SS17C_7 - Physics 7C SS1 Lecture 7: Electricity &...

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Physics 7C SS1 Lecture 7: Electricity & Magnetism Electric Potential Magnetism: RHR 1 & 2
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2 Quiz 3
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3 Model of Electric Phenomena: Electric Field and Forces Each source charge Q generates an Electric Field E Q , directions as shown The net Electric Field is the sum of all the source fields Charge q, placed in an electric field E tot , experiences a force F elec on q =q E tot . For + test charge, force points in the same direction as field. For - test charge, force points in opposite direction of field Field, Forces, Potential Energy, and Potential
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4 Reviewing what you’ve previously studied… Gravitational Potential Energy 1 2 3
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5 Relationship between Potential Energy and Force Potential Energy r - 0
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6 Relationship between Potential Energy and Force 1 2 3 Potential Energy r - 0 More slope closer to earth means F is greater there F = - PE / r , the - slope Force increases with greater slope
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Relationship between PE and Force At which of the points below does the force have the greatest magnitude? 1 2 3 4 Magnitude of Force = slope of PE vs. r graph. F
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SS17C_7 - Physics 7C SS1 Lecture 7: Electricity &...

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