Interaction of electric and magnetic fields with a human body
... Point: The method based on the fact that ions with the same charges are repelled. Contrary, the ions with the opposite charges are attracted. E.g. Drugs as anesthetics when dissolved in water create Cations+ . Thus, when Anodal + Current is applied, then drugs are electrically pushed to the body. Or ...
... Point: The method based on the fact that ions with the same charges are repelled. Contrary, the ions with the opposite charges are attracted. E.g. Drugs as anesthetics when dissolved in water create Cations+ . Thus, when Anodal + Current is applied, then drugs are electrically pushed to the body. Or ...
ELECTRODYNAMICS
... In practice, motors turn very smoothly and at high speeds. In these motors the coil consists of a soft iron core, surrounded by many loops. Such a coil is called an armature. Most armatures have many coils which are placed at different angles. Each coil in the armature has its own commutator. ...
... In practice, motors turn very smoothly and at high speeds. In these motors the coil consists of a soft iron core, surrounded by many loops. Such a coil is called an armature. Most armatures have many coils which are placed at different angles. Each coil in the armature has its own commutator. ...
Exam 1 (Chapters 1-4) - UNC Physics and Astronomy
... 3. There is no current induced in the coil. 4. There is not enough information to determine the direction. 13. When does an incandescent light bulb have the greatest current flowing through it? 1. right after the light is turned on 2. a few seconds after the light is turned on 3. a long time after t ...
... 3. There is no current induced in the coil. 4. There is not enough information to determine the direction. 13. When does an incandescent light bulb have the greatest current flowing through it? 1. right after the light is turned on 2. a few seconds after the light is turned on 3. a long time after t ...
File
... the use of instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it should never be made available to students exc ...
... the use of instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it should never be made available to students exc ...
Different wavelengths…
... The hydrogen atoms in the sun are actually ions (charged nuclei), in which the electrons are removed from the atoms because of the high temperature of the sun. As these ions move, they generate electric and magnetic fields – these moving fields are the light we see, as well as the other electrom ...
... The hydrogen atoms in the sun are actually ions (charged nuclei), in which the electrons are removed from the atoms because of the high temperature of the sun. As these ions move, they generate electric and magnetic fields – these moving fields are the light we see, as well as the other electrom ...
Ch18elecric currents
... Chemical reactions within the cell create a potential difference between the terminals by slowly dissolving them. This potential difference can be maintained even if a current is kept flowing, until one or the other terminal is ...
... Chemical reactions within the cell create a potential difference between the terminals by slowly dissolving them. This potential difference can be maintained even if a current is kept flowing, until one or the other terminal is ...
IV Ch 5
... (b) This is because some of the kinetic energy required to drive the bicycle is converted into electrical energy by the dynamo. ...
... (b) This is because some of the kinetic energy required to drive the bicycle is converted into electrical energy by the dynamo. ...
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.