Search
- https://phys.libretexts.org/Courses/Berea_College/Electromagnetics_I/02%3A_Electric_and_Magnetic_Fields/2.01%3A_What_is_a_FieldA field is the continuum of values of a quantity as a function of position and time.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/12%3A_Magnetism/12.05%3A_Electromagnetism/12.5.06%3A_Induced_Voltage_and_Magnetic_FluxWhen the switch is closed, a magnetic field is produced in the coil on the top part of the iron ring and transmitted to the coil on the bottom part of the ring. It is the change in magnetic field that...When the switch is closed, a magnetic field is produced in the coil on the top part of the iron ring and transmitted to the coil on the bottom part of the ring. It is the change in magnetic field that creates the current in the following way: a changing magnetic field induces an electric field, which results in the induced voltage. The faster the motion, the greater the voltage, and there is no voltage when the magnet is stationary relative to the coil.
- https://phys.libretexts.org/Bookshelves/Quantum_Mechanics/Quantum_Mechanics_III_(Chong)/04%3A_Identical_Particles/4.04%3A_Quantum_Field_TheoryFor simplicity, suppose the particles are bosons, and let \[\hat{\psi}(\mathbf{r}) = \sum_\mu \varphi_\mu(\mathbf{r}) \, \hat{a}_\mu, \quad\;\; \hat{\psi}^\dagger(\mathbf{r}) = \sum_\mu \varphi_\mu^*(...For simplicity, suppose the particles are bosons, and let ˆψ(r)=∑μφμ(r)ˆaμ,ˆψ†(r)=∑μφ∗μ(r)ˆa†μ. Using the aforementioned wavefunction properties, we can derive the inverse relations \[\hat{a}_\mu = \int d^dr \; \varphi_\mu^*(\mathbf{r}) \, \hat{\psi}(\mathbf{r}), \quad\;\; \hat{a}_\mu^\dagger = \int d^dr \; \varphi_\mu(\mathbf{r}) \, \hat{\psi}^\dagger(\m…
- https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Electromagnetics_I_(Ellingson)/02%3A_Electric_and_Magnetic_Fields/2.01%3A_What_is_a_FieldA field is the continuum of values of a quantity as a function of position and time.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/11%3A_Electricity/11.03%3A_Static_Electricity/11.3.05%3A_Electric_Field-_Concept_of_a_Field_RevisitedBoth charges are the same distance from Q. (a) Since q1 is positive, the force F1 acting on it is repulsive. (b) The charge q2 is negative and greater in magnitude than \(q_{1...Both charges are the same distance from Q. (a) Since q1 is positive, the force F1 acting on it is repulsive. (b) The charge q2 is negative and greater in magnitude than q1, and so the force F2 acting on it is attractive and stronger than F1.
- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/03%3A_Electric_Charge_and_Electric_Field/3.05%3A_Electric_Field-_Concept_of_a_Field_RevisitedIn this context, that means that we can (in principle) calculate the total electric field of many source charges by calculating the electric field of only q1 at position P, then calculate the fie...In this context, that means that we can (in principle) calculate the total electric field of many source charges by calculating the electric field of only q1 at position P, then calculate the field of q2 at P, while—and this is the crucial idea—ignoring the field of, and indeed even the existence of, q1.
- https://phys.libretexts.org/Bookshelves/College_Physics/College_Physics_1e_(OpenStax)/18%3A_Electric_Charge_and_Electric_Field/18.04%3A_Electric_Field-_Concept_of_a_Field_RevisitedContact forces, such as between a baseball and a bat, are explained on the small scale by the interaction of the charges in atoms and molecules in close proximity. They interact through forces that in...Contact forces, such as between a baseball and a bat, are explained on the small scale by the interaction of the charges in atoms and molecules in close proximity. They interact through forces that include the Coulomb force. Action at a distance is a force between objects that are not close enough for their atoms to “touch.” That is, they are separated by more than a few atomic diameters.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/15%3A_Electromagnetic_Radiation/15.02%3A_Electromagnetic_Waves_Overview/15.2.01%3A_Electromagnetic_Wave_PropertiesProperties of electromagnetic waves and associated concepts.
