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Lec7,8&amp;9-EnergyPotential

# Lec7,8&amp;9-EnergyPotential - ECSE 351 Electromagnetic...

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ECSE 351 Electromagnetic Fields McGill University – ECE Dept. - Prof. Milica Popovi ć Lectures 7, 8 & 9: Energy and Potential ¾ Objective: concepts of field potential and energy contained in the field ¾ Why potential ? – A scalar field that offers simpler route to find electric field intensity than direct integration of Coulomb’s law ¾ How do we determine the energy contained in a region of space with electric field intensity?

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How did we define electric field intensity? If you want to move the test charge within the field, what do you need to “invest”? McGill – ECE – ECSE 351 Electromagnetic Fields – Prof. M. Popovic E JG A B
Work = Force ×Distance If an external source wants to move charge Q by some small distance, it needs to contradict the electric field. Small (differential) work: dW Q E dL = − JJGJJG i McGill – ECE – ECSE 351 Electromagnetic Fields – Prof. M. Popovic E JG A B dL JJG

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Work = Force ×Distance If an external source wants to move charge Q by some small distance, it needs to contradict the electric field. Small (differential) work: McGill – ECE – ECSE 351 Electromagnetic Fields – Prof. M. Popovic dW Q E dL = − JJGJJG i “-” : We are opposing the field Force of the field Work is done along this short path