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55.56_Ampere and Lorentz Forces (1).ppt
Lesson Objectives
By the end of the lesson learners will be able:
10.4.1.2 – to apply the left-hand rule and describe the effect of a magnetic field on moving charged particles and electrical conductor;
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Keywords
English | Russian | Kazakh |
Magnetic flux | ||
Magnetic flux density | ||
Permeability | ||
Fleming’s left hand rule | ||
Conventional current | ||
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In 1820
‘’A compass needle moved when it was close to a wire connected to a battery.’’
Professor Hans Christian Oersted
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B
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B
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RIGHT HAND GRIP RULE:
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current outwards
current inwards
B
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I
N turns
In the middle
At the end
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N
S
Interaction between a magnet and the field due to a current
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FLEMING’S LEFT HAND MOTOR RULE
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FLEMING’S LEFT HAND MOTOR RULE
FOREFINGER = FIELD
THUMB = MOTION
SECOND FINGER = CURRENT
Activity
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Answers
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F=B I LSinθ
Where L = length of conductor in the field
Θ is the angle between B and I
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Like Currents Attracts Unlike Currents Repel
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Force experienced by a charged particle (charge Q) moving with a velocity, v ,in a magnetic field of Flux density, B.
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Q
Particle travels L metres from A to B in t seconds
F = B I L
F = BQv
B-Force on Charged Particles
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F
F
THE FORCE IS ALWAYS PERPENDICULAR TO THE MOTION
THE PARTICLE MUST MOVE ALONG AN ARC OF A CIRCLE
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Frequency of Rotation, f
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The frequency ,f, is independent of the radius and the velocity
This is the principle of the CYCLOTRON
Particle Radius, r.
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CYCLOTRON
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High frequency square wave
www.youtube.com/watch?v=_T745HXduHY
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