chapter 28 sources of magnetic field. p roducing a magnetic field permanent magnet current
TRANSCRIPT
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CHAPTER 28Sources of Magnetic Field
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PRODUCING A MAGNETIC FIELD
Permanent Magnet Current
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MAGNETIC FIELD DUE TO CURRENTS
Right hand rule
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VIEW FROM THE TOP
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VIEW FROM THE SIDE
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BIOT-SAVART LAWWhat if the wire isn’t straight?
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INFINITE STRAIGHT WIRE
P
I
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INFINITE STRAIGHT WIRE (CONT.)
P
Strategy: write everything in terms of θ
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EXAMPLE: ADDITION OF B FIELDS
Find the B field at point P
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EXAMPLE: ADDITION OF B FIELDS
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FORCE BETWEEN PARALLEL CURRENTS
What if the currents are in opposite directions?
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FIELD AND FORCE
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MAGNETIC FIELD OF A LOOP OF CURRENT
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COIL AND BAR MAGNETThe magnetic field produced by a coil is almost identical to that of a bar magnet.
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SOLENOIDS
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SOLENOIDS
n: Number of turns per unit lengthUnit of n: m-1=turns/m
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AMPERE’S LAW
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RIGHT HAND RULE, AGAIN
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LONG STRAIGHT WIRE, AGAIN
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DERIVATION: B FIELD INSIDE A SOLENOID
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APPLICATIONS