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PPE36_Motionalemf

# PPE36_Motionalemf - Induction Motional emf and Induced...

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© RHJansen Induction Induction Motional Motional emf emf and and Induced Currents Induced Currents

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v Force on Current Carrying Wires © RHJansen A metal conducting rod, with neutral charge, is moved at constant velocity through a uniform magnetic field. What does the right hand rule predict about the force on the protons? and the force on the electrons?
v Force on Current Carrying Wires © RHJansen The protons (right hand) are pushed upward while the electrons (left hand) are pushed downward. What force is holding the charges apart? Force Magnetism F B What force is pulling the charges together? Force Electricity F E Are the charges moving up or down? No, then the forces must be equal and opposite. v F E = Φ Β

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Force on Current Carrying Wires © RHJansen As long as this moves at constant velocity it is acting a bit like a capacitor. The electric field created can be solved with v F E = Φ Β qE = θωΒ E = ωΒ
Force on Current Carrying Wires © RHJansen There is now a potential difference between the ends of the rod. This is induced (created), so we use emf instead of voltage. v The induced emf can be solved with ε = ΒΛω ε emf B Magnetic Field L Length of the rod v Speed of the rod Δ V = ε High potential Low potential

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PPE36_Motionalemf - Induction Motional emf and Induced...

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