L12 outlook
... Consider electromagnetic radiation normal to a metal sheet of size L2 and conductance σ. The electric field induces a current density J = σE. The magnetic field is B perpendicular to J, and like E lies in the metal sheet. It induces a force density J×B = σE×B in the direction of the radiation. The p ...
... Consider electromagnetic radiation normal to a metal sheet of size L2 and conductance σ. The electric field induces a current density J = σE. The magnetic field is B perpendicular to J, and like E lies in the metal sheet. It induces a force density J×B = σE×B in the direction of the radiation. The p ...
The Two Kinds of Electric Charge
... right through all terrestrial objects. We cannot therefore explain the electrostatic force acting on so-called neutral terrestrial objects on the basis that they are negatively charged. In order to explain it, we resort to the fact that the applied electrostatic field induces linear polarization wit ...
... right through all terrestrial objects. We cannot therefore explain the electrostatic force acting on so-called neutral terrestrial objects on the basis that they are negatively charged. In order to explain it, we resort to the fact that the applied electrostatic field induces linear polarization wit ...
transparencies
... Br: 35), high density (7.5 g/cm3) and wide bandgap (2.7 eV). The photon stopping power of TlBr crystal is greater than any of the semiconductors discussed. Therefore this material is promising for Xand γ- ray detector applications. K.S.Shah et al. IEEE Trans.Nucl.Sci. (1989) v.39(1). ...
... Br: 35), high density (7.5 g/cm3) and wide bandgap (2.7 eV). The photon stopping power of TlBr crystal is greater than any of the semiconductors discussed. Therefore this material is promising for Xand γ- ray detector applications. K.S.Shah et al. IEEE Trans.Nucl.Sci. (1989) v.39(1). ...
Motion Along a Straight Line at Constant
... field and will experience a force given by : F = BIl Each side will experience a force in the opposite direction. Since we have a coil with n turns the force is given by F = BIln We have a pair of forces in opposite direction which are not acting through the same line (i.e. We have a couple equal to ...
... field and will experience a force given by : F = BIl Each side will experience a force in the opposite direction. Since we have a coil with n turns the force is given by F = BIln We have a pair of forces in opposite direction which are not acting through the same line (i.e. We have a couple equal to ...
B-field Concept Tests
... positive or negative. If the charge is positive the force from the E-field is down, the force from the B-field is up, and the forces cancel. But if charge is negative, both forces switch direction and the forces still cancel. In either case, the fact that the particles is moving with constant veloci ...
... positive or negative. If the charge is positive the force from the E-field is down, the force from the B-field is up, and the forces cancel. But if charge is negative, both forces switch direction and the forces still cancel. In either case, the fact that the particles is moving with constant veloci ...
Electric Fields
... symmetric. Note that all the lines that emanate from the positive charge land on the negative charge. Also pictured is a small positive charge placed in the field and the force vector on it at that position. This is the vector sum of the forces exerted on the test charge by each field charge. Note t ...
... symmetric. Note that all the lines that emanate from the positive charge land on the negative charge. Also pictured is a small positive charge placed in the field and the force vector on it at that position. This is the vector sum of the forces exerted on the test charge by each field charge. Note t ...
If a bar magnet is divided into two equal pieces,
... downward component of the Earth's magnetic field is 6.0 × 10-5 T. Find the magnitude of the induced emf between the tips of the wings when the speed of the plane is 225 m/s. A) 0.41 V B) 0.61 V C) 0.81 V D) 1.2 V E) 1.4 V ...
... downward component of the Earth's magnetic field is 6.0 × 10-5 T. Find the magnitude of the induced emf between the tips of the wings when the speed of the plane is 225 m/s. A) 0.41 V B) 0.61 V C) 0.81 V D) 1.2 V E) 1.4 V ...
PowerPoint 演示文稿
... •Upon insertion, free charge on plates maintained constant: q0 ; •At molecular level, alignment of dipole moments inside the dielectric decrease potential over metal plates; •Total charge that contributes to the voltage: q1= q0 /ε; •Polarization(P) == Surface Density of the Polarized Charge (σ0-σ1). ...
... •Upon insertion, free charge on plates maintained constant: q0 ; •At molecular level, alignment of dipole moments inside the dielectric decrease potential over metal plates; •Total charge that contributes to the voltage: q1= q0 /ε; •Polarization(P) == Surface Density of the Polarized Charge (σ0-σ1). ...
Electrostatics
Electrostatics is a branch of physics that deals with the phenomena and properties of stationary or slow-moving electric charges with no acceleration.Since classical physics, it has been known that some materials such as amber attract lightweight particles after rubbing. The Greek word for amber, ήλεκτρον electron, was the source of the word 'electricity'. Electrostatic phenomena arise from the forces that electric charges exert on each other. Such forces are described by Coulomb's law.Even though electrostatically induced forces seem to be rather weak, the electrostatic force between e.g. an electron and a proton, that together make up a hydrogen atom, is about 36 orders of magnitude stronger than the gravitational force acting between them.There are many examples of electrostatic phenomena, from those as simple as the attraction of the plastic wrap to your hand after you remove it from a package, and the attraction of paper to a charged scale, to the apparently spontaneous explosion of grain silos, the damage of electronic components during manufacturing, and the operation of photocopiers. Electrostatics involves the buildup of charge on the surface of objects due to contact with other surfaces. Although charge exchange happens whenever any two surfaces contact and separate, the effects of charge exchange are usually only noticed when at least one of the surfaces has a high resistance to electrical flow. This is because the charges that transfer to or from the highly resistive surface are more or less trapped there for a long enough time for their effects to be observed. These charges then remain on the object until they either bleed off to ground or are quickly neutralized by a discharge: e.g., the familiar phenomenon of a static 'shock' is caused by the neutralization of charge built up in the body from contact with insulated surfaces.