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P21_Magnetism - applications(1)(1)

P21_Magnetism - applications(1)(1) - Magnetism Exam III...

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Magnetism
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Exam III
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Exam III
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Exam III
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Magnetism
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Recall: Unit The magnetic field (B-field) is measured in Tesla 1 T = 1 N/A·m. (we will get back to the definition of 1 Tesla) Sometimes used: the gauss (G): 1 G = 10-4 T
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Recall: Magnetic Field Due to a Long Straight Wire The field is inversely proportional to the distance from the wire: The constant μ 0 is called the permeability of free space , and has the value:
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Solenoids and Electromagnets A solenoid is a long coil of wire . If it is tightly wrapped, the magnetic field in its interior is almost uniform :
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Solenoids and Electromagnets If a piece of iron is inserted in the solenoid, the magnetic field greatly increases. Such electromagnets have many practical applications.
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Recall: The Force on a Charged Particle Moving in a Magnetic Field Slide 24-46 The force is perpendicular to the plane spanned by B and v Defines the Tesla!
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Force on an Electric Current in a Magnetic Field; A magnet exerts a force on a current-carrying wire. The direction of the force is given by a right-hand rule.
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