2. Electrostatic Potential and Capacitance.
... must be zero. For cavity of arbitrary shape, this is not enough to claim that electric field inside must be zero. The cavity may have positive and negative charges with total charge zero. To dispose of this possibility, we consider a closed loop, part of which is inside the cavity along a field line ...
... must be zero. For cavity of arbitrary shape, this is not enough to claim that electric field inside must be zero. The cavity may have positive and negative charges with total charge zero. To dispose of this possibility, we consider a closed loop, part of which is inside the cavity along a field line ...
directed_reading_Magnetism and Electricity p518-52
... _____ 2. Which of the following actions will decrease the strength of the magnetic field of an electromagnet? a. using fewer loops of wire per meter in the coil b. decreasing the current in the wire c. removing the iron core d. All of the above 3. Describe what happens when you hold a compass close ...
... _____ 2. Which of the following actions will decrease the strength of the magnetic field of an electromagnet? a. using fewer loops of wire per meter in the coil b. decreasing the current in the wire c. removing the iron core d. All of the above 3. Describe what happens when you hold a compass close ...
Notes 18 3318 Faraday`s Law
... Note: If the curl of the electric field is zero for the field from a point charge, then by superposition it must be zero for the field from any charge density. ...
... Note: If the curl of the electric field is zero for the field from a point charge, then by superposition it must be zero for the field from any charge density. ...
magnetic field.
... Magnetic Field • As we saw, force is perpendicular to both v and B. • The force is also largest for v perpendicular to B, smallest for v parallel to B. ...
... Magnetic Field • As we saw, force is perpendicular to both v and B. • The force is also largest for v perpendicular to B, smallest for v parallel to B. ...
投影片 1
... The diagrams above are two of the forms used to visualize the force on a moving positive charge. The force is in the opposite direction for a negative charge moving in the direction shown. One fact to keep in mind is that the magnetic force is perpendicular to both the magnetic field and the charge ...
... The diagrams above are two of the forms used to visualize the force on a moving positive charge. The force is in the opposite direction for a negative charge moving in the direction shown. One fact to keep in mind is that the magnetic force is perpendicular to both the magnetic field and the charge ...
Part II
... – The electric force acts on a charged particle regardless of whether the particle is moving. – The magnetic force acts on a charged particle only when the particle is in motion. Copyright © 2009 Pearson Education, Inc. ...
... – The electric force acts on a charged particle regardless of whether the particle is moving. – The magnetic force acts on a charged particle only when the particle is in motion. Copyright © 2009 Pearson Education, Inc. ...
Magnets
... them. However until those charges line up or move in the same direction they have very little force. ...
... them. However until those charges line up or move in the same direction they have very little force. ...
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.