Phys 0175 - Lecture 24

Phys 0175 - Lecture 24 - Lecture 24 (Mar. 16, 2009):...

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Unformatted text preview: Lecture 24 (Mar. 16, 2009): Magnetic Fields due to Currents (contd): Illustrative examples (long straight wire; circular arc; current loop) The importance of a single current loop Force between parallel current-carrying conductors Amperes Law Applications of Amperes Law (inside/outside solid conductor) Apply the Biot-Savart Law to find the magnetic field produced at C by a current in a circular arc of wire: 2 2 2 sin sin90 4 4 4 4 4 C C i ds i ds dB r R i i iRd B d R R R = = = = = 4 C i B R = Find the direction of B by using the right hand rule Special case: complete circular loop when =2 4 2 C C i i B B R R = = A single current loop is the most fundamental source of a magnetic field (electrons in orbit around a nucleus). Note that a single current loop has both a N and a S pole. That is why they are inseparable. The magnetic field produced by a single loop of wire. It resembles the magnetic field around a bar magnet N S What is the magnetic field produced by a current loop of radius a away from the center of the circle?...
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Phys 0175 - Lecture 24 - Lecture 24 (Mar. 16, 2009):...

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