Magnetic force (b)
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1) The magnetic force on a charged particle is defined by the Lorentz force law as Fmag = qv x B, where q is the charge, v is the velocity, and B is the magnetic field. 2) The magnetic force is perpendicular to both the velocity and magnetic field vectors. 3) For a charged particle in a uniform magnetic field, the particle will undergo uniform circular motion, with the magnetic force providing the necessary centripetal force.
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The document discusses various topics related to the magnetic effects of electric current:
1. It defines Lorentz magnetic force and Fleming's left hand rule for determining the direction of force on a current-carrying conductor in a magnetic field.
2. It describes the forces experienced by parallel current-carrying conductors and defines the ampere based on the forces between two such conductors.
3. It explains how a moving coil galvanometer works, including how torque is produced on a current-carrying coil in a magnetic field and how the galvanometer can be converted into an ammeter or voltmeter.
Reporting of Ernie and Robelss final.docx
The document discusses the relationship between electric potential, potential energy, and electric fields. It provides background on how electric potential is analogous to gravitational potential and depends on location within an electric field. Examples are given to illustrate how to calculate electric potential, potential differences, and potential energy at different points based on distances from charges.
24 pius augustine em induction & ac
1. The document discusses the principles of electromagnetic induction, including Faraday's law and Lenz's law. It provides explanations and examples of motional EMF, factors affecting induced EMF, and applications of electromagnetic induction such as generators and eddy currents.
2. Key experiments are described, such as Michael Faraday's coil-magnet experiment which demonstrated that a changing magnetic field can induce an electric current in a loop of wire.
3. Applications of electromagnetic induction discussed include generators, transformers, eddy current brakes, induction furnaces, and traffic light triggers.
CAPITULO 26
This document contains conceptual physics problems and their solutions related to magnetic fields. Some key points:
- Problem 1 discusses how electrons moving perpendicular to a magnetic field will follow a circular path due to the magnetic force.
- Problem 12 determines that an electron will be deflected upward when passing through a magnetic field, due to the direction of the magnetic force on electrons being opposite that of positive charges.
- Problem 22 calculates the magnetic force acting on a segment of wire using the cross product relationship between the magnetic field, the wire orientation, and the current in the wire.
Ch12 - magnetism notes
Magnetism has been observed for over 2000 years, with lodestones found in ancient Greece exhibiting magnetic properties. In the 1820s, Hans Christian Oersted discovered the relationship between electricity and magnetism when an electric current caused a compass needle to deflect. Magnets have both north and south poles and magnetic fields that exert forces on other magnetic and electrically charged objects. The strength of this magnetic force depends on factors like the distance from the magnet, the velocity and charge of the object, and the magnetic field strength.
Lorentz Force Magnetic Force on a moving charge in uniform Electric and Mag...
1) The document discusses the magnetic force on a moving charge and current-carrying conductor in a uniform magnetic field. It defines magnetic force and derives the formulae for force on a charge and conductor.
2) Magnetic force on a moving charge is directly proportional to the charge, velocity perpendicular to the magnetic field, and magnetic field strength. The formula derived is F = qvBsinθ.
3) Magnetic force on a current-carrying conductor is directly proportional to the current, length of conductor perpendicular to the magnetic field, and magnetic field strength. The formula is F = ILBsinθ.
Gravitational Fields
1) Newton proposed that all objects with mass attract each other with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
2) An object in free fall experiences a sensation of weightlessness because both it and the elevator/spacecraft it is in are accelerating downward at the same rate due to gravity, so there is no relative acceleration between them.
3) A satellite in orbit around a planet is weightless because the centripetal acceleration needed to maintain its orbit exactly counteracts the acceleration due to gravity, resulting in no net acceleration felt by objects in the spacecraft.
physics430_lecture07.ppt
1) The document discusses kinetic and potential energy, introducing concepts like conservative and non-conservative forces. Conservative forces have potential energies and their work is path independent.
2) Examples are provided to illustrate these concepts, such as calculating the work done by different forces on a particle moving between two points along different paths.
3) The principle of conservation of energy is described for systems with only conservative forces, where the total mechanical energy (kinetic plus potential) remains constant. For systems with non-conservative forces, the change in mechanical energy equals the work done by those forces.
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Magnetic force (b)
- 1. We can define the magnetic field B (a vector quantity) at a point by the vector force Fmag at that point experienced by a particle with charge q and velocity v: Lorentz Force Law Fmag q v B If there is also an electric field E at this point, then in addition to the above magnetic force, there will be an electric force Felec=qE and the total force Ftot on the charge will be Ftot = Felec Fmag q E q v B q E v B Ph 2B Lectures by George M. Fuller, UCSD
- 2. The (vector) magnetic force on the charge q at a particular point in space depends on the (vector) velocity of the charge and on the (vector) magnetic field at this point: Fmag q v B The magnitude of this force is Fmag Fmag q v B sin qvB sin where is the angle between the velocity vector v and the magnetic field vector B at this point in space Ph 2B Lectures by George M. Fuller, UCSD
- 3. What about the direction of the force? Since the force is given by the vector cross product of velocity and magnetic field, it is orthogonal to both of these. That is, the force vector will be perpendicular to the plane defined by the velocity and magnetic field vectors. Fmag v B Fmag q v B Fmag Fmag q v B sin qvB sin Ph 2B Lectures by George M. Fuller, UCSD
- 4. Consider the motion of a charged particle in a uniform magnetic field. Let us take the case where the particle’s velocity is in the plane of the screen and the uniform magnetic field points out of the screen: B-field (tips of arrows) v Fmag v Fmag Result: uniform circular motion
- 5. In this case, we have uniform circular motion with the centripetal acceleration supplied by the magnetic force: Fmag qvB sin qvB sin90 qvB Fcentrip m v2 r v Fmag r where r is the radius of the circular path Fmag Fcentrip qvB m v2 r r m v qB Ph 2B Lectures by George M. Fuller, UCSD