PHY 182 1st Edition Lecture 26Outline of Last Lecture I. When a Capacitor is ChargingII. When a Capacitor is DischargingOutline of Current Lecture I. The Discovery of MagnetismII. Sources of Magnetic FieldsCurrent LectureThe Discovery of Magnetism- Magnetic poles were discovered about 2500 years ago and the two types of poles were called "North" and "South".- Like poles repel and opposite poles attract.- Earth is essentially like a giant magnet. The geographical North pole is actually the magnetic South pole and the geographical South pole is the magnetic North pole.- No experimental data has ever been found to prove the existence of isolated magnetic poles however many physicists have tried.Sources of Magnetic Field- Moving charges create magnetic fields. Stationary charges cannot produce magnetic fields.- For a single point charge, you can use the cross product of the charge's velocity and position in an equation for "B" to find magnetic field. The magnetic field vector is perpendicular to "r".- The SI unit of magnetic field is Tesla.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- The simple equation for magnetic field applies only for point charges with a constant velocity.- For more complicated cross products involving vectors with multiple components, you can use matrices to find the resultant vector. Write the two initial vectors in a 3 by 3 matrix then calculate the determinant of the
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