chapter19-3 - Chapter 19 Magnetism Today Magnetic field...

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Chapter 19 Magnetism
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Today s Magnetic field around a current carrying wire. Ampere’s law olenoid s Solenoid s Material magnetism (not on exam)
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Clicker 1 s An airplane, with mobile, negative charges on its fuselage and wings, moving north over the US. is moving north over the US. Which tip of the plane accumulates the negative charge. (1) Nose (2) left wingtip (3) right wingtip (4) tail
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Hans Christian Oersted s 1777 – 1851 s Best known for observing that a ompass needle compass needle deflects when placed near a wire carrying a current s First evidence of a connection between electric and magnetic phenomena
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Magnetic Fields – Long Straight Wire s A current-carrying wire produces a magnetic field he compass needle s The compass needle deflects in directions tangent to the circle s The compass needle points in the direction of the magnetic field produced by the current
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Direction of the Field of a Long Straight Wire s Right Hand Rule #2 s Grasp the wire in our right hand your right hand s Point your thumb in the direction of the current s Your fingers will curl in the direction of the field
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Magnitude of the Field of a Long Straight Wire s The magnitude of the field at a distance r from a wire carrying a current of I is s µ o = 4 π x 10 -7 T . m / A s µ o is called the permeability of free space 2 o I B r μ π =
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André-Marie Ampère s 1775 – 1836 s Credited with the discovery of electromagnetism s Relationship between electric currents and magnetic fields
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Ampère’s Law s Ampère found a procedure for deriving the relationship between the current in an arbitrarily shaped wire and the magnetic field produced by the wire s Ampère’s Circuital Law s Σ B || ∆ℓ = µ o I s Sum over the closed path
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Ampère’s Law, cont s Choose an arbitrary closed ath around the path around the current s Sum all the products of B || ∆ℓ around the closed path
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Ampère’s Law to Find B for a Long Straight Wire s Use a closed circular path s
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chapter19-3 - Chapter 19 Magnetism Today Magnetic field...

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