Magnetic field II. Plan Motion of charge particle in electric and magnetic fields Some applications of magnetic fields.

Slides:



Advertisements
Similar presentations
Applications of the Motion of Charged Particles in a Magnetic Field AP Physics C Montwood High School R. Casao.
Advertisements

Halliday/Resnick/Walker Fundamentals of Physics 8th edition
Coulomb law.
Chapter 26: The Magnetic Field
Chapter 28. Magnetic Field
Magnetic Fields Magnetic Field Forces on a Charged Particle Magnetic Field Lines Crossed Fields and Hall Effect Circulating Charged Particles Cyclotrons.
2/xx/07184 Lecture 221 PHY 184 Week 6 Spring 2007 Lecture 22 Title: The Lorentz Force = q v x B.
Wednesday, Oct. 26, 2005PHYS , Fall 2005 Dr. Jaehoon Yu 1 PHYS 1444 – Section 003 Lecture #16 Wednesday, Oct. 26, 2005 Dr. Jaehoon Yu Charged Particle.
Lecture 20 Discussion. [1] A rectangular coil of 150 loops forms a closed circuit with a resistance of 5 and measures 0.2 m wide by 0.1 m deep, as shown.
Charged Particles in Electric and Magnetic Fields Motion of charged particles Lorentz Force Examples: cyclotron, mass spectrometer.
>80>80>90>70>70>60>60>50>50>29>40>40 Average 66.4 Median 69 High 96 Low 29.
Hall Effect. E and B  Charged particles can be subject to both electric and magnetic fields.
Electricity and Magnetism
Example: Magnetic Force Directions from Right Hand Rule
A B C D. Find currents through resistors Loop 1Loop 2Loop 3 Loop 4 I1I1 I2I2 I3I3 I5I5 I4I4 loop 1: loop 2: loop 3: nodes: Five independent equations.
>78>63>42 >33 Average 57.2 Median 58.5 Highest 98 Lowest 18.
The Magnetic Field The force on a charge q moving with a velocity The magnitude of the force.
K L University 1. 2 MAGNETOSTATICS 3 Introduction to Magneto statics – Magnetic field, Magnetic force, Magnetic flux Biot-Savat’s law -- Applications.
Chapter 28 Magnetic Fields Key contents Magnetic fields and the Lorentz force The Hall effect Magnetic force on current The magnetic dipole moment.
Magnetic Forces and Fields. Magnetic Force Right Hand Rule: Cross Product.
Comprehension Check 1. An electron is moving at right angles to uniform magnetic field; if the electron is moving at.010c, determine the magnitude of the.
Lecture 16 Magnetic Fields& Force
Magnetic Fields Chapter 26 Definition of B
Chapter 26 Magnetism Poles – Location where the magnetic effect is the strongest –North pole – pole of a freely suspended magnet which points towards geographic.
Lecture 14-1 Magnetic Field B Magnetic force acting on a moving charge q depends on q, v. (q>0) If q
Lecture 26: WED 18 MAR Magnetic fields Physics 2113 Jonathan Dowling “I’ll be back…. Aurora Borealis.
The Magnetic Field The force on a charge q moving with a velocity The magnitude of the force.
ELECTRIC POTENTIAL ENERGY AND ELECTRIC POTENTIAL POTENTIAL ENERGY ELECTRIC POTENTIAL WORK-ENERGY THEOREM CAPACITANCE COMBINATIONS OF CAPACITORS STORED.
P212c28: 1 Chapter 28: Magnetic Field and Magnetic Forces Iron ore found near Magnesia Compass needles align N-S: magnetic Poles North (South) Poles attracted.
Copyright © 2009 Pearson Education, Inc. Applications: Motors, Loudspeakers, Galvanometers.
General Physics II, Additional Questions, By/ T.A. Eleyan 1 Additional Questions Lec. 15,16.
Magnetism1 Review on Magnetism Chapter 28 Magnetism2 Refrigerators are attracted to magnets!
Magnetic Fields Chapter The force exerted by a magnetic field Definition of B 26.3 Motion of a charged particle in a magnetic field Applications.
Current and Resistance FCI.  Define the current.  Understand the microscopic description of current.  Discuss the rat at which the power.
The force on a charge q moving with a velocity The magnitude of the force.
When charged particles move through magnetic fields, they experience a force, which deflects them Examples of such particles are electrons, protons, and.
Physics 121 Practice Problem Solutions 09 Magnetic Fields
Magnetic field Chapter 28.
Charged Particles Discovery of Electron Electron beams in Fields Electron Tubes Measurement of the Charge of the Electron.
Magnetic Forces and Magnetic Fields
Magnetic Field and Magnetic Forces
Book Reference : Pages To understand that the path of a charged particle in a magnetic field is circular 2.To equate the force due to the magnetic.
Electric Current Chapter 19-1: Pages Physics.
Magnetism Chapter 27 opener. Magnets produce magnetic fields, but so do electric currents. An electric current flowing in this straight wire produces a.
Electric Field.
The cyclotron The cyclotron was first designed to avoid the need for a long linear accelerator to obtain high energy particles. It consists of two semicircular.
Chapter 21 Magnetic Force.
RHR. Direction of force See also: Right-hand ruleRight-hand rule The direction of force on a charge or a current can be determined by a mnemonic known.
1 Motion in Electric Fields SACE Stage 2 Physics.
Chapter 21 Magnetic Force. Clicker A)1.7 V B)3.4 V C)5.1 V D)6.8 V E)12 V What is the potential difference across the clams when I take bulb out of circuit?
Background In a cyclotron, protons are kept moving in a circular path by a uniform magnetic field at right angles to the plane of the path. Only a few.
AP Physics Summer Institute Free-Response-Questions MAGNETISM.
The Hall Effect AP Physics Montwood High School R.Casao.
What are the only two forces your body has ever experienced??? GRAVITY ELECTRIC.
Motion of Charges in Electric Fields. Electric Potential Difference.
8.4 – Motion of Charged Particles in Magnetic Fields
Magnetic Force on Moving Charged Particles.
Electricity and Magnetism
Moving Charges in Magnetic Fields
Applications: Motors Loudspeakers Galvanometers
Charged Particles in Electric and Magnetic Fields
Magnetic Fields Contents: Overview What Produces Magnetic Field
A proton is accelerated from rest through a potential difference of V
Physics for Scientists and Engineers, 3rd edition
The Effect Of A Magnetic Field On Charged Particles
Magnetic Fields Chapter 26 Definition of B
Electricity and Magnetism
Magnetic Monopoles Does there exist magnetic charge, just like electric charge? An entity which carried such magnetic charge would be called a magnetic.
Magnetic Fields Chapter 26 Definition of B
Chapter 28 Magnetic Fields
Presentation transcript:

Magnetic field II

Plan Motion of charge particle in electric and magnetic fields Some applications of magnetic fields

Force due to magnetic field Recap………

Work done by F B Magnetic forces can only alter the direction Recap………

Lorentz force Recap………

Combined E and B fields Acts on any particle, whether moving or in rest Acts on moving particle only

Motion of charge particle in the crossed B and E fields

Particle for which v = E/B, passes un deflected. Particles with other fields are deflected. If

Calculation of e/m for electron

Motion of charged particle in constant uniform Electric field Neglecting gravity A Parabolic path

Substituting

Constant uniform Magnetic field B does not change the speed It changes direction of motion Thus particle should move in a circle, if moves in a plane perpendicular to B.

xx xx x x x x xxxx xxxxx x x x xx x xx x x xx x x x x x x x FBFB

Angular frequency xx xx x x x x xxxx xxxxx x x x xx x xx x x xx x x x x x x x FBFB xx xx x x x x xxxx xxxxx x x x xx x xx x x xx x x x x x x x FBFB

Applications of magnetic fields

Application I- Mass spectrometer R m To separate the ionized atoms

Application II - Cyclotron E. O. Lawerence (1930)

Worlds largest cyclotron

This is at TRIUMF (CANARA) Accelerates protons to energies up to 520 MeV Diameter of machine = 18 m During the course of acceleration proton travels 45 km

Magnetic Mirror Non uniform magnetic field Strong B Weak B

The Hall effect Provides a way to determine sign and density of charge carriers. conductor w

If electrons are majority charge carriers EHEH E B E conductor

V H If the electrons are majority charge carriers + - conductor

Density of charge carriers

Convention If the voltage of lower terminal is negative, electrons are the majority charge carriers. If the voltage of lower terminal is positive, holes are the majority charge carriers.

Show that, in terms of hall electric field E H, and the current density j, the number of charge carriers per unit volume is given by

Show that the ratio of hall electric field to the electric field is given by

A metal strip 10 cm long, 1 cm wide and 1mm thick moves with constant speed v through a magnetic field of 1mT perpendicular to the strip. A potential difference of 4 V is measured between the points x and y across the strip. Calculate the speed v V d is the velocity of strip now V d = 0.4 m/s

A strip of copper 150 m thick is placed in a magnetic field B = 0.65 T perpendicular to the plane of the strip. A current 23 A is setup in the strip. What hall potential difference will appear across the width of the strip if there were 8.5 x electrons/m 3 ?