PH 122 Lecture Notes - Electromagnetic Radiation, Electronic Oscillator, Inductor
Document Summary
Electromagnetic waves are traveling waves of electric and magnetic fields. Electromagnetic waves come in a wide range of wavelengths. There is more to the spectrum than the rainbow. Long wavelengths act like waves, short wavelengths like particles. A changing magnetic field induces an electric field. A changing electric field induces a magnetic field too. L is the inductance; the unit is the henry (h) Maximum capacitor charge is like a fully stretched spring. The capacitor discharges until the current is a maximum. Maximum current is like the blocks on the end of the spring having maximum speed. It continues until the capacitor is fully recharged with the opposite polarization. Now the discharge goes in the opposite direction. The current continues until the initial capacitor charge in restored. An accelerated charge emits a pulse of electric and magnetic fields. Maxwell"s equations say the speed should be v = An oscillating charge will emit an electromagnetic wave.
