Solution - Homepages at WMU
... 2.) Yesterday afternoon, after PHYS-115 class, after my 4pm appointment, after the rest of the Physics Dept. meeting, one of my colleagues came in and showed me a problem in a Physics Education book and he didn’t understand how they could get the answer they did. I looked at it, at first agreed with ...
... 2.) Yesterday afternoon, after PHYS-115 class, after my 4pm appointment, after the rest of the Physics Dept. meeting, one of my colleagues came in and showed me a problem in a Physics Education book and he didn’t understand how they could get the answer they did. I looked at it, at first agreed with ...
Reference Frames and Relative Motion Uniform Circular Motion
... Magnetic Fields We know about the existence of magnetic fields by their effect on moving charges. The magnetic field exerts a force on the moving charge. ...
... Magnetic Fields We know about the existence of magnetic fields by their effect on moving charges. The magnetic field exerts a force on the moving charge. ...
Exam 3
... 6. A particle with positive charge q .3 10 6 -C is a distance d 1.5 10 2 -m from a long straight wire that carries a current i 5-A. The particle is traveling with speed v = 1000 m/s perpendicular to the wire. What are the direction and magnitude of the force on the particle if it is moving away fr ...
... 6. A particle with positive charge q .3 10 6 -C is a distance d 1.5 10 2 -m from a long straight wire that carries a current i 5-A. The particle is traveling with speed v = 1000 m/s perpendicular to the wire. What are the direction and magnitude of the force on the particle if it is moving away fr ...
Topic 5 , 10-11 New Selected Problems 2 - Solutions
... LENZ´S LAW : Induced field Opposes the External-Original field to resist any change in magnetic flux Due to conservation of energy and action – reaction forces : LENZ´S LAW states that when a magnetic field induces an emf in a loop (called the external - original field) ; the loop in turn, generates ...
... LENZ´S LAW : Induced field Opposes the External-Original field to resist any change in magnetic flux Due to conservation of energy and action – reaction forces : LENZ´S LAW states that when a magnetic field induces an emf in a loop (called the external - original field) ; the loop in turn, generates ...
Polarized sphere
... A long hollow cylinder is made out of a non-conducting material with a radius R, length l, and a charge surface density σ. An external torque rotates the cylinder around its axis with a steady angular velocity of ω(t) = αt 1. Calculate the magnetic field inside the cylinder 2. What is the electrical ...
... A long hollow cylinder is made out of a non-conducting material with a radius R, length l, and a charge surface density σ. An external torque rotates the cylinder around its axis with a steady angular velocity of ω(t) = αt 1. Calculate the magnetic field inside the cylinder 2. What is the electrical ...
Notes for Instructors
... The behavior of any magnetic material is dependent on the presence of unpaired electrons and how they interact with each other. To be more precise, any moving electrical charge with spin and orbital angular momentum generates a magnetic field in a system. The quantitative measurement of the magnetic ...
... The behavior of any magnetic material is dependent on the presence of unpaired electrons and how they interact with each other. To be more precise, any moving electrical charge with spin and orbital angular momentum generates a magnetic field in a system. The quantitative measurement of the magnetic ...
Basic Physical Principles of MRI
... There is electric charge on the surface of the proton, thus creating a small current loop and generating magnetic moment µ. ...
... There is electric charge on the surface of the proton, thus creating a small current loop and generating magnetic moment µ. ...
search for quantum gyroscopes - Ohio University Physics and
... As the magnetic field is switched on in êz direction then, the top instead of acquiring minimum electromagnetic energy configuration (i.e., magnetic moment aligned with the magnetic field), however, the sphere precesses under the effect of gyroscopic torque which is proportional to (Ix - Iy) ωxωz. T ...
... As the magnetic field is switched on in êz direction then, the top instead of acquiring minimum electromagnetic energy configuration (i.e., magnetic moment aligned with the magnetic field), however, the sphere precesses under the effect of gyroscopic torque which is proportional to (Ix - Iy) ωxωz. T ...
Faraday`s Law and Induced Emf
... magnetic flux is given by ΦB = B⃗ ⋅ A⃗ = BA cos(θ) , where θ is the angle between the magnetic field B⃗ and the normal to the surface of area A. To find the direction of the induced emf, one can use Lenz's law: The induced current's magnetic field opposes the change in the magnetic flux that induce ...
... magnetic flux is given by ΦB = B⃗ ⋅ A⃗ = BA cos(θ) , where θ is the angle between the magnetic field B⃗ and the normal to the surface of area A. To find the direction of the induced emf, one can use Lenz's law: The induced current's magnetic field opposes the change in the magnetic flux that induce ...
Superconductivity
Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamerlingh Onnes on April 8, 1911 in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect, the complete ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of perfect conductivity in classical physics.The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In ordinary conductors, such as copper or silver, this decrease is limited by impurities and other defects. Even near absolute zero, a real sample of a normal conductor shows some resistance. In a superconductor, the resistance drops abruptly to zero when the material is cooled below its critical temperature. An electric current flowing through a loop of superconducting wire can persist indefinitely with no power source.In 1986, it was discovered that some cuprate-perovskite ceramic materials have a critical temperature above 90 K (−183 °C). Such a high transition temperature is theoretically impossible for a conventional superconductor, leading the materials to be termed high-temperature superconductors. Liquid nitrogen boils at 77 K, and superconduction at higher temperatures than this facilitates many experiments and applications that are less practical at lower temperatures.