How electricity is made
... If a coil of wire is moved within a magnetic field so that it passes through the magnetic field, electrons in the wire are made to move. When the coil of wire is connected into an electric circuit (at the terminals A and a) the electrons get energy to move in a certain direction and a current will f ...
... If a coil of wire is moved within a magnetic field so that it passes through the magnetic field, electrons in the wire are made to move. When the coil of wire is connected into an electric circuit (at the terminals A and a) the electrons get energy to move in a certain direction and a current will f ...
B - UConn Physics
... • Force on wire 2 due to B at wire 1: • Total force between wires 1 and 2: ...
... • Force on wire 2 due to B at wire 1: • Total force between wires 1 and 2: ...
Teacher`s notes 19 How does the strength of an
... flow with only a few volts across such a coil. The coil will also heat up dangerously at such currents and the supply fuse will blow, or the insulation will start to burn. A resistor in the circuit to limit the current flow is essential. The limiting resistor does not need to be a fixed value resist ...
... flow with only a few volts across such a coil. The coil will also heat up dangerously at such currents and the supply fuse will blow, or the insulation will start to burn. A resistor in the circuit to limit the current flow is essential. The limiting resistor does not need to be a fixed value resist ...
lecture 29 motional emf
... field. There will be induced current called eddy currents although there are now no well-defined current paths. The magnetic force due to the eddy currents opposes the motion of the conductor to the right. ...
... field. There will be induced current called eddy currents although there are now no well-defined current paths. The magnetic force due to the eddy currents opposes the motion of the conductor to the right. ...
Exercises
... 1. Circle the letter beside the names of the two scientists who, in 1831, independently discovered that electric current can be produced in a wire by simply moving a magnet into or out of a wire coil. a. Einstein and Faraday b. Faraday and Henry c. Henry and Newton d. Maxwell and Newton 2. Is the fo ...
... 1. Circle the letter beside the names of the two scientists who, in 1831, independently discovered that electric current can be produced in a wire by simply moving a magnet into or out of a wire coil. a. Einstein and Faraday b. Faraday and Henry c. Henry and Newton d. Maxwell and Newton 2. Is the fo ...
Homework Wednesday 4-25-2012 A resistor is made in the form of a
... current I varies linearly with time t as follows: I = ct, where c is a positive constant. The long wire is in the same plane as a square loop of wire of side b, as shown in the diagram. The side of the loop nearest the long wire is parallel to it and a distance a from it. The loop has a resistance R ...
... current I varies linearly with time t as follows: I = ct, where c is a positive constant. The long wire is in the same plane as a square loop of wire of side b, as shown in the diagram. The side of the loop nearest the long wire is parallel to it and a distance a from it. The loop has a resistance R ...
week10-ampere
... Calculate flux through closed surface Small magnetic material such as found in compass can indicate local direction of magnetic field ...
... Calculate flux through closed surface Small magnetic material such as found in compass can indicate local direction of magnetic field ...
Force between magnets
Magnets exert forces and torques on each other due to the complex rules of electromagnetism. The forces of attraction field of magnets are due to microscopic currents of electrically charged electrons orbiting nuclei and the intrinsic magnetism of fundamental particles (such as electrons) that make up the material. Both of these are modeled quite well as tiny loops of current called magnetic dipoles that produce their own magnetic field and are affected by external magnetic fields. The most elementary force between magnets, therefore, is the magnetic dipole–dipole interaction. If all of the magnetic dipoles that make up two magnets are known then the net force on both magnets can be determined by summing up all these interactions between the dipoles of the first magnet and that of the second.It is always more convenient to model the force between two magnets as being due to forces between magnetic poles having magnetic charges 'smeared' over them. Such a model fails to account for many important properties of magnetism such as the relationship between angular momentum and magnetic dipoles. Further, magnetic charge does not exist. This model works quite well, though, in predicting the forces between simple magnets where good models of how the 'magnetic charge' is distributed is available.