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# l13p - Today Announcements HW#6 is due by 8:00 am Wednesday...

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ISP209s7 Lecture 13 -1- Today • Announcements: – HW#6 is due by 8:00 am Wednesday February 27th. • Electric Fields • Electric Circuits • Light and the Electromagnetic Spectrum ISP209s7 Lecture 13 -2- Example of Electric Field Map for two charges Charge creates a field. The field points form + to – charge. ISP209s7 Lecture 13 -3- A visual picture – Electric Potential - + +q Steep slope means a larger force. Positive charge makes a hill Negative charge makes a valley. ISP209s7 Lecture 13 -4- Gravitational (or electric) Potential/Field height The force is related to the rate of change of potential.

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ISP209s7 Lecture 13 -5- Map for the Electric Field – Electric Potential The slope gives a measure of the electric field. The height is electric potential, V, measured in volts ISP209s7 Lecture 13 -6- Another example- 4 charges + charge gives positive potential (V) - charge gives negative potential (V) position position ISP209s7 Lecture 13 -7- Example -20 V +20 V The electric potential is the same everywhere on a conductor. ISP209s7 Lecture 13 -8- Electric fields and potential • In equilibrium the electric field in a metal conductor (electrons to move) is zero. • This means that inside a metal the electric potential is flat, like the flat top of a table. • Sitting inside a metal cage is like sitting on top of
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l13p - Today Announcements HW#6 is due by 8:00 am Wednesday...

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