Physics 30 Lesson 15 Electric Fields
... charged ebonite rod) can have an effect on another object (a charged pith ball) over a distance. How does the pith ball “know” about the presence of the ebonite rod? Conversely, how does the ebonite rod “know” about the presence of the pith ball? After all, they are not in direct contact. It is this ...
... charged ebonite rod) can have an effect on another object (a charged pith ball) over a distance. How does the pith ball “know” about the presence of the ebonite rod? Conversely, how does the ebonite rod “know” about the presence of the pith ball? After all, they are not in direct contact. It is this ...
magnet and magnetism
... waves consist of the growth and collapse of electric and magnetic fields at right angles to each other. Oersted's original discovery was that an electric current flowing through a wire would set up a magnetic field around the wire and that increasing the current would strengthen the magnetic field. ...
... waves consist of the growth and collapse of electric and magnetic fields at right angles to each other. Oersted's original discovery was that an electric current flowing through a wire would set up a magnetic field around the wire and that increasing the current would strengthen the magnetic field. ...
投影片 1
... P: A rod of length L has a charge Q uniformly spread over t. A test charge q is positioned at a distance a from the rod’s midpoint. Q: What is the force F that the rod exerts on the charge q? ...
... P: A rod of length L has a charge Q uniformly spread over t. A test charge q is positioned at a distance a from the rod’s midpoint. Q: What is the force F that the rod exerts on the charge q? ...
Physics, Chapter 32: Electromagnetic Induction
... around the secondary coil induced an electromotive force in the coil, and, since the coil is part of a closed circuit, this induced emf produced a current in the secondary circuit. There are many ways in which the magnetic field around the coil S may be varied Suppose, for example, that the key of t ...
... around the secondary coil induced an electromotive force in the coil, and, since the coil is part of a closed circuit, this induced emf produced a current in the secondary circuit. There are many ways in which the magnetic field around the coil S may be varied Suppose, for example, that the key of t ...
Lecture_10
... Moving in a Magnetic Field Example 27-5: Magnetic force on a proton. A magnetic field exerts a force of 8.0 x 10-14 N toward the west on a proton moving vertically upward at a speed of 5.0 x 106 m/s (a). When moving horizontally in a northerly direction, the force on the proton is zero (b). Determin ...
... Moving in a Magnetic Field Example 27-5: Magnetic force on a proton. A magnetic field exerts a force of 8.0 x 10-14 N toward the west on a proton moving vertically upward at a speed of 5.0 x 106 m/s (a). When moving horizontally in a northerly direction, the force on the proton is zero (b). Determin ...
History of electromagnetic theory
For a chronological guide to this subject, see Timeline of electromagnetic theory.The history of electromagnetic theory begins with ancient measures to deal with atmospheric electricity, in particular lightning. People then had little understanding of electricity, and were unable to scientifically explain the phenomena. In the 19th century there was a unification of the history of electric theory with the history of magnetic theory. It became clear that electricity should be treated jointly with magnetism, because wherever electricity is in motion, magnetism is also present. Magnetism was not fully explained until the idea of magnetic induction was developed. Electricity was not fully explained until the idea of electric charge was developed.