PHY_10_55_V2_P_Ampere force. Lorentz force

  • ppt
  • 08.05.2020
Публикация на сайте для учителей

Публикация педагогических разработок

Бесплатное участие. Свидетельство автора сразу.
Мгновенные 10 документов в портфолио.

Иконка файла материала PHY_10_55_V2_P_Ampere force. Lorentz force.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;

1

Ampere force and Lorentz force

Keywords

English

Russian

Kazakh

Magnetic flux

Magnetic flux density

Permeability

Fleming’s left hand rule

Conventional current

2

Professor Hans Christian Oersted

In 1820
‘’A compass needle moved when
it was close to a wire connected to a battery.’’

3

RIGHT HAND GRIP RULE:

4

current outwards

current inwards

B

5

I

N turns

In the middle

At the end

6

N

S

Interaction between a magnet and the field due to a current

7

8

FLEMING’S LEFT HAND MOTOR RULE

9

FLEMING’S LEFT HAND MOTOR RULE

FOREFINGER = FIELD

THUMB = MOTION

SECOND FINGER = CURRENT

Activity

10

Answers

11

12

F=B I LSinθ

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

13

Like Currents Attracts Unlike Currents Repel

14

Force experienced by a charged particle (charge Q) moving with a velocity, v ,in a magnetic field of Flux density, B.

+

Q

Particle travels L metres from A to B in t seconds

F = B I L

F = BQv

B-Force on Charged Particles

15

16

+

F

F

THE FORCE IS ALWAYS PERPENDICULAR TO THE MOTION

THE PARTICLE MUST MOVE ALONG AN ARC OF A CIRCLE

+

17

Frequency of Rotation, f

+

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

This is the principle of the CYCLOTRON

Particle Radius, r.

 

18

19

CYCLOTRON

+

High frequency square wave

www.youtube.com/watch?v=_T745HXduHY

20