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- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/11%3A_Electricity/11.03%3A_Static_Electricity/11.3.03%3A_Electric_FieldsIf a proton is placed in a uniform electric field so that the electric force on the proton just balances its weight, what is the magnitude and direction of the field? If you determined the electric fi...If a proton is placed in a uniform electric field so that the electric force on the proton just balances its weight, what is the magnitude and direction of the field? If you determined the electric field intensity in a field using a test charge of 1.0×10 −6 C and then repeated the process with a test charge of 2.0×10 −6 C, would the forces on the charges be the same? What is the relationship between the direction of the electric field and the direction of the electric force?
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/12%3A_Magnetism/12.05%3A_Electromagnetism/12.5.04%3A_GeneratorA generator can also produce direct current by using a split ring commutator that changes external connections every half turn of the armature so that even though the current in the coil changes direc...A generator can also produce direct current by using a split ring commutator that changes external connections every half turn of the armature so that even though the current in the coil changes direction, every time the current in the coil changes direction, the external connection switches so that the external current always goes in the same direction.
- https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Electromagnetics_and_Applications_(Staelin)/04%3A_Static_and_Quasistatic_Fields/4.01%3A_IntroductionThis page discusses static electric and magnetic fields in the context of Maxwell’s equations, focusing on their behavior when time derivatives are absent. It covers the relationships between electric...This page discusses static electric and magnetic fields in the context of Maxwell’s equations, focusing on their behavior when time derivatives are absent. It covers the relationships between electric fields and charge distributions, the roles of electric and magnetic potentials, and the derivation of Laplace’s equation under partial charge knowledge. Quasistatic conditions enable simplifications in analyzing field interactions.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/15%3A_Electromagnetic_Radiation/15.02%3A_Electromagnetic_Waves_OverviewOrigins of the concept of electromagnetic waves.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/11%3A_Electricity/11.03%3A_Static_Electricity/11.3.04%3A_Electric_Field_LinesNote that the electric field is defined for a positive test charge q, so that the field lines point away from a positive charge and toward a negative charge. (See Figure \PageIndex2.) The el...Note that the electric field is defined for a positive test charge q, so that the field lines point away from a positive charge and toward a negative charge. (See Figure \PageIndex2.) The electric field strength is exactly proportional to the number of field lines per unit area, since the magnitude of the electric field for a point charge is E=k|Q|/r2 and area is proportional to r2.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/15%3A_Electromagnetic_Radiation/15.03%3A_Electromagnetic_SpectrumLight can be described as a continuous spectrum of frequencies that correspond to wavelengths of light.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/11%3A_Electricity/11.03%3A_Static_Electricity/11.3.01%3A_Electric_Charge_and_Electric_ForceWhen a negatively charged object is brought near the knob of a neutral electroscope, the negative charge repels the electrons in the knob, and those electrons move down the stem into the leaves. If th...When a negatively charged object is brought near the knob of a neutral electroscope, the negative charge repels the electrons in the knob, and those electrons move down the stem into the leaves. If the electroscope has been permanently negatively charged, and a negatively charge object is brought near the knob, the leaves will separate even further, showing the new object has the same charge as the leaves.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/11%3A_Electricity/11.05%3A_Electric_Circuits/11.5.01%3A_Energy_Transfer_in_Electric_CircuitsThe electrical energy across a resistor is determined to be the current squared multiplied by the resistance and the time. The joule, however, is a very small unit of energy and using the joule to sta...The electrical energy across a resistor is determined to be the current squared multiplied by the resistance and the time. The joule, however, is a very small unit of energy and using the joule to state the amount of energy used by a household would require a very large number. The electric energy transferred to a resistor in a time period is equal to the electric power multiplied by time, E=Pt, and can also be calculated using E=I 2 Rt.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/11%3A_Electricity/11.03%3A_Static_Electricity/11.3.07%3A_Conductors_and_Applications_of_ElectrostaticsThe pointed conductor (B) on top in the large sphere picks up the charge. (The induced electric field at the points is so large that it removes the charge from the belt.) This can be done because the ...The pointed conductor (B) on top in the large sphere picks up the charge. (The induced electric field at the points is so large that it removes the charge from the belt.) This can be done because the charge does not remain inside the conducting sphere but moves to its outside surface.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/15%3A_Electromagnetic_Radiation/15.04%3A_Electromagnetic_Waves_and_MaterialsPart of what influences the way a wave interacts with an object is the frequency of the source and the molecular properties of the object. Red light travels the fastest through the prism and is deflec...Part of what influences the way a wave interacts with an object is the frequency of the source and the molecular properties of the object. Red light travels the fastest through the prism and is deflected the least, Blue light travels the slowest and is affected more by passing through the prism.
- https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Electromagnetics_and_Applications_(Staelin)/06%3A_Actuators_and_sensors_motors_and_generators/6.03%3A_Rotary_magnetic_motorsThis page covers the operational principles of commutated rotary magnetic motors and reluctance motors, emphasizing torque generation, back-voltage, and design parameters for efficiency. Key points in...This page covers the operational principles of commutated rotary magnetic motors and reluctance motors, emphasizing torque generation, back-voltage, and design parameters for efficiency. Key points include the continuous rotary motion ensured by commutation, the relationship between maximum speed and back-voltage, the role of magnetic fields in torque production, and the importance of rotor/stator gap widths.
