Magnetic Force on a Charged Particle

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Magnetic Force on a Charged Particle

• Source
• Dr. Peggy Bertrand
• Oak Ridge HS

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Chapter Assignments

• Chapter 20
• HW1 Q2,3,9-11 and P1,7,8,
• HW2 P11(c), 12-14,17(c), 26,29,30(c) , 48(c) and
  49(c)
• Chapter 21
• HW3 Q2,4,6,8 and P1-5,9(c),10(c),14,15

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20-3 Force on Electric Current in Magnetic Field
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No force, vectors are parallel
F qvB (3.0x10-6C)(3x105m/s)(200x10-3 T) F
1.8x10-1 N down
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F qVB sin q direction up
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Motion of Charged Particles in a Magnetic Field
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q is forced down toward the bottom of the page
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• F qvB
• B F/qv 2000N
• C(1.6x10 -19C)(3x105 m/s)
• B _____T

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F qVB (1.60x10-19 C) (300,000 m/s) (2000x10-3
T)
Direction out of the page
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F Eq 2000 N/c (1.60 x 10-19 c)
Direction out of page (use left hand for
electron)
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F qVB 1.60 x 10 -19 c (300,000 m/s)(2 T)
Direction down
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Magnetic Force on Current Carrying Wires
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B F/qV 400V/20,000 m/s A volt is work done
per unit charge (J/q) Direction into the page
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F I L B sin Q F (30A)(100m)(0.4T)(sin90) F
_____________N
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F I L B ? B F / I L (40N/m) / 15A
Current moving to the right
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Sources of Magnetic Fields
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Announcement

• Mechanics Review
• this week
• Wednesday from 0830 - 0900

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More on Sources of B Fields
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r2
r 1
Opposite Directions could be zero
I1 10.0 A I2 13.0 A
7.0 m
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I
B
A
B - out A - in
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Magnetic Flux
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• 0
• Max F BAcos q 4.2x10-3T(6m2)cosq ___ Weber
• c) F BAcos q 4.2x10-3T(6m2)cos30 ___ Wb

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F B p r2 cos 40 r sr F / B p cos 40 r sr
.250Wb / (0.050T)(3.14)(cos40) ______m
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• http//hyperphysics.phy-astr.gsu.edu/hbase/electri
  c/farlaw.html

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E - 1000 (500 x 10-3 T / 0.01 s) ___V
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• http//www.launc.tased.edu.au/online/sciences/phys
  ics/Lenz's.html

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clockwise
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counterclockwise
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B mo I / 2 p r ? I 2 p Br / mo mo 2 p x
10-7 Power I2 r
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Direction of current through 3 ohm resistor is
down
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