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Lecture_14-Part_1

Lecture_14-Part_1 - far from coil 3 2 2 4 z I R B z π π...

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Unformatted text preview: far from coil: 3 2 2 4 z I R B z π π μ = sq p z p E z = = 3 2 4 1 πε far from dipole: AI I R z B z = = = 2 3 2 4 π μ μ π μ magnetic dipole moment: μ- vector in the direction of B Magnetic Dipole Moment What is the magnetic dipole moment μ of a 3000-turn 3 × 5 cm rectangular coil that carries a current of 2 A? AI = μ for one turn 3 2 4 z B z μ π μ = NAI = μ for N turns μ = 3000 ⋅ 0.03 ⋅ . 05 m 2 ( ) 2 A ( ) = 9 A ⋅ m 2 Exercise The magnetic dipole moment μ acts like a compass needle! In the presence of external magnetic field a current-carrying loop rotates to align the magnetic dipole moment μ along the field B . Twisting of a Magnetic Dipole How does the magnetic field around a bar magnet look like? The Magnetic Field of a Bar Magnet N S How do magnets interact with each other? Magnets interact with iron or steel, nickel, cobalt. Does it interact with charged tape? Does it work through matter? Does superposition principle hold? Similarities with E-field: • can repel or attract • superposition • works through matter Differences with E-field: •...
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Lecture_14-Part_1 - far from coil 3 2 2 4 z I R B z π π...

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