PowerPoint Presentation - Electric, magnetic and
... circuit (a conductor or a coil) in itself and the current that produces it. Usually denoted as Lii. 2. Mutual inductance: the ratio of the flux produced by circuit i in circuit j and the current in circuit i that produced it. Denoted as Mij. A mutual inductance exists between any two circuits as lon ...
... circuit (a conductor or a coil) in itself and the current that produces it. Usually denoted as Lii. 2. Mutual inductance: the ratio of the flux produced by circuit i in circuit j and the current in circuit i that produced it. Denoted as Mij. A mutual inductance exists between any two circuits as lon ...
Particle Acceleration at Astrophysical Shocks
... 3. All Accelerated particles are protons The basic physics is in the so-called streaming instability: of particles that propagates in a plasma is forced to move at speed smaller or equal to the Alfven speed, due to the excition of Alfven waves in the medium. ...
... 3. All Accelerated particles are protons The basic physics is in the so-called streaming instability: of particles that propagates in a plasma is forced to move at speed smaller or equal to the Alfven speed, due to the excition of Alfven waves in the medium. ...
Chapter 7. Electrodynamics 7.1. Electromotive Force
... fraction of space, and therefore definitely will not intercept all field lines outside the square loop. Therefore, there will be more field lines pointing into the page then there are field lines pointing out of the page. Consequently, the net magnetic flux will be pointing into the page. When the c ...
... fraction of space, and therefore definitely will not intercept all field lines outside the square loop. Therefore, there will be more field lines pointing into the page then there are field lines pointing out of the page. Consequently, the net magnetic flux will be pointing into the page. When the c ...
Chapter 08
... a tool. • This danger can be minimized by grounding the case with a dedicated wire through the third wire on the plug. ...
... a tool. • This danger can be minimized by grounding the case with a dedicated wire through the third wire on the plug. ...
Free Response Questions for 2012 AP Physics
... Directions: Answer all three questions. The suggested time is about 15 minutes for answering each of the questions, which are worth 15 points each. The parts within a question may not have equal weight. Show all your work in this booklet in the spaces provided after each part. ...
... Directions: Answer all three questions. The suggested time is about 15 minutes for answering each of the questions, which are worth 15 points each. The parts within a question may not have equal weight. Show all your work in this booklet in the spaces provided after each part. ...
Fourier-based magnetic induction tomography for mapping resistivity
... where F is a filter threshold; k is the spatial frequency with k = 冑k2x + k2y where kx = p⌬k and ky = q⌬k 共p and q are integers兲; ⌬k = 2L / W 共W is the number of points along the x-axis in the W ⫻ W discrete mesh兲; S is the signal in k-space before filtering and S⬘ is the signal in k-space after fi ...
... where F is a filter threshold; k is the spatial frequency with k = 冑k2x + k2y where kx = p⌬k and ky = q⌬k 共p and q are integers兲; ⌬k = 2L / W 共W is the number of points along the x-axis in the W ⫻ W discrete mesh兲; S is the signal in k-space before filtering and S⬘ is the signal in k-space after fi ...
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.