Lect_16_note

Lect_16_note - Chapter 30 -1 Sources of the Magnetic Field...

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Chapter 30 -1 Sources of the Magnetic Field
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Magnetic Field of a Wire ± A compass can be used to detect the magnetic field ± When there is no current in the wire, there is no field due to the current ± The compass needles all point toward the Earth’s north pole due to the Earth’s magnetic field
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Magnetic Field of a Wire ± Here the wire carries a strong current ± The compass needles deflect in a direction tangent to the circle ± This shows the direction of the magnetic field produced by the wire
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Magnetic Field of a Wire ± Find out B as a function of r and Ι ± The direction of B is circular ± Due to symmetry, the magnitude of B should be constant at constant r.
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Magnetic Force Between Two Parallel Wires 2 1 B F F
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Parallel Wires ± Two parallel wires each carry a steady current ± The current in wire 2 produces a field B 2 ± B 2 exerts a force F 1 on wire 1 B 2 F = q v x B
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Parallel Wire ± F 1 = I 1 B 2 ± F 2 = I 2 B 1 F 1 = q 1 v 1 x B 2 F 2 = q 2 v 2 x B 1 B 2 F 2 B 1 F 1 = F I B = I /B 2 /I
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Parallel Wire ± The result can be expressed as B ∝ Ι The force F ∝ Ι 1 Ι 2 B 2
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This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lect_16_note - Chapter 30 -1 Sources of the Magnetic Field...

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