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Unformatted text preview: 1 Lecture 11 Chapter 18. Magnetic Field * Electron Current * Detecting Magnetic Fields *1 Biot-Savart Law: Single Moving Charge 2/15/11 2 Bar Magnets From North to South N S N S Attraction S N N S Repulsion Bar magnet ... two poles: N and S Like poles repel; Unlike poles attract. Magnetic Field lines: (defined in same way as electric field lines, direction and density) N S 2/15/11 3 3 Magnetic monopoles? Electric dipole consists of two opposite charges monopoles. N S Break magnet: S N 2/15/11 4 Electrostatics versus Electric Current 2 2/15/11 5 Electric Current Electrostatic Equilibrium Steady-State Note: Current arrow is drawn in direction in which positive charge carriers would move, even if the actual charges are negative & move in the opposite direction. Battery + - 2/15/11 6 Electric Current Notice that flow of positive charge in one direction, + + + + + + + + + + CURRENT I Becomes more positive Becomes more negative Its completely equivalent to negative charge in the...
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