Lecture%2031%202220%20Spring%202009

% - Reminders and Announcements HW 18 is due today HW 19 will be due next Friday Help Room Hours(Physics 117 Room Hours(Physics 117 M 4-8 pm T

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1 Reminders and Announcements • HW 18 is due today; HW 19 will be due next Friday • Help Room Hours (Physics 117) Help Room Hours (Physics 117): – M 4-8 pm, T 3-6:30, W 3-6:30, R 4:30-8, F 2-6 Chapter 34 Electromagnetic Waves James Clerk Maxwell • In 1865, James Clerk Maxwell provided a mathematical theory that showed a close relationship between all electric and magnetic phenomena • Maxwell’s equations also predict the existence of electromagnetic waves that propagate through space Displacement Current • Ampere’s law in the original form is valid only if any electric fields present are constant in time – Maxwell modified the law to include time- varying electric fields • Maxwell added an additional term which includes a factor called the displacement current , I d Displacement Current • The electric flux through S 2 is EA A is the area of the capacitor plates E is the electric field between the plates • If q is the charge on the plate at any time, Φ E = EA = q / ε o Displacement Current • Therefore, the displacement current is E do dd q I ε
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% - Reminders and Announcements HW 18 is due today HW 19 will be due next Friday Help Room Hours(Physics 117 Room Hours(Physics 117 M 4-8 pm T

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