55.56_Ampere and Lorentz Forces (1)
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# 55.56_Ampere and Lorentz Forces (1)

Оценка 4.6
ppt
08.05.2020 55.56_Ampere and Lorentz Forces (1).ppt

## Lesson Objectives By the end of the lesson learners will be able: 10 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 3

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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current outwards

current inwards

B

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I

N turns

In the middle

At the end

## N S Interaction between a magnet and the field due to a current 9

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

## F=B I LSinθ Where L = length of conductor in the field Θ is the angle between 15

F=B I LSinθ

Where L = length of conductor in the field
Θ is the angle between B and I

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 + The frequency ,f, is independent of the radius and the velocity 22

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

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CYCLOTRON

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High frequency square wave