解答五 27.51. (a) Identify: Use Eq. (27.2) to relate Set Up: The
... EVALUATE: v1 v2 . v2 is perpendicular to B whereas only the component of v1 perpendicular to B contributes to the force, so it is expected that F2 F1, as we found. 28.43.IDENTIFY: Apply Ampere’s law. SET UP: To calculate the magnetic field at a distance r from the center of the cable, apply Ampe ...
... EVALUATE: v1 v2 . v2 is perpendicular to B whereas only the component of v1 perpendicular to B contributes to the force, so it is expected that F2 F1, as we found. 28.43.IDENTIFY: Apply Ampere’s law. SET UP: To calculate the magnetic field at a distance r from the center of the cable, apply Ampe ...
Magnetic Field of Force
... Lodestone, or magnetite is magnetic and will align itself in a north-south position. Currently iron, nickel and cobalt are used for magnets. Law of Magnetic Poles Opposite magnetic poles attract Similar magnetic poles repel Drawing Fields (Magnetic Field of Force, ) 1. Lines close together signify ...
... Lodestone, or magnetite is magnetic and will align itself in a north-south position. Currently iron, nickel and cobalt are used for magnets. Law of Magnetic Poles Opposite magnetic poles attract Similar magnetic poles repel Drawing Fields (Magnetic Field of Force, ) 1. Lines close together signify ...
![1] How will you show the directive property of a magnet? Suspend a](http://s1.studyres.com/store/data/001625610_1-56f6c1434741143a0c22f345e56fb644-300x300.png)
1] How will you show the directive property of a magnet? Suspend a
... 2] Magnets are often used in toys. 3] Magnets are used in scrap and salvage operations. 4] TVs and computer screens employ electromagnets. 5] Speakers and microphones use permanent magnets. 6] Hard disks record data on a thin magnetic coating. 3] Properties of magnetic lines of force: 1] Each line i ...
... 2] Magnets are often used in toys. 3] Magnets are used in scrap and salvage operations. 4] TVs and computer screens employ electromagnets. 5] Speakers and microphones use permanent magnets. 6] Hard disks record data on a thin magnetic coating. 3] Properties of magnetic lines of force: 1] Each line i ...
Chapter 29: Magnetic Fields
... An important difference between electric charges and magnetic poles is that poles are ALWAYS found in pairs (N,S) while single electric charges (positive or negative) can be isolated. For example, if you cut a bar magnet in half each piece will have a N and S pole! 2) The forces between magnets are ...
... An important difference between electric charges and magnetic poles is that poles are ALWAYS found in pairs (N,S) while single electric charges (positive or negative) can be isolated. For example, if you cut a bar magnet in half each piece will have a N and S pole! 2) The forces between magnets are ...
Magnetism - WordPress.com
... Magnitude of the B-vector is proportional to the force acting on the moving charge, magnitude of the moving charge, the magnitude of its velocity, and the angle between v and the B-field. Unit is the Tesla or the Gauss (1 T = 10,000 G). ...
... Magnitude of the B-vector is proportional to the force acting on the moving charge, magnitude of the moving charge, the magnitude of its velocity, and the angle between v and the B-field. Unit is the Tesla or the Gauss (1 T = 10,000 G). ...
36. Three 1/2 μF capacitors are connected in series as shown in the
... 52. The figures above show parts of two circuits, each containing a battery of emf ε and internal resistance r. The current in each battery is 1 A, but the direction of the current in one battery is opposite to that in the other. If the potential differences across the batteries' terminals are 10 V ...
... 52. The figures above show parts of two circuits, each containing a battery of emf ε and internal resistance r. The current in each battery is 1 A, but the direction of the current in one battery is opposite to that in the other. If the potential differences across the batteries' terminals are 10 V ...
Magnetic Fields, Forces, and EM Induction
... 7. A power line carries a 225-A current from east to west parallel to the surface of Earth. a. What is the magnitude of the force acting on each meter of the wire due to Earth’s magnetic field? ...
... 7. A power line carries a 225-A current from east to west parallel to the surface of Earth. a. What is the magnitude of the force acting on each meter of the wire due to Earth’s magnetic field? ...
Magnetic field
A magnetic field is the magnetic effect of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field. The term is used for two distinct but closely related fields denoted by the symbols B and H, where H is measured in units of amperes per meter (symbol: A·m−1 or A/m) in the SI. B is measured in teslas (symbol:T) and newtons per meter per ampere (symbol: N·m−1·A−1 or N/(m·A)) in the SI. B is most commonly defined in terms of the Lorentz force it exerts on moving electric charges.Magnetic fields can be produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin. In special relativity, electric and magnetic fields are two interrelated aspects of a single object, called the electromagnetic tensor; the split of this tensor into electric and magnetic fields depends on the relative velocity of the observer and charge. In quantum physics, the electromagnetic field is quantized and electromagnetic interactions result from the exchange of photons.In everyday life, magnetic fields are most often encountered as a force created by permanent magnets, which pull on ferromagnetic materials such as iron, cobalt, or nickel, and attract or repel other magnets. Magnetic fields are widely used throughout modern technology, particularly in electrical engineering and electromechanics. The Earth produces its own magnetic field, which is important in navigation, and it shields the Earth's atmosphere from solar wind. Rotating magnetic fields are used in both electric motors and generators. Magnetic forces give information about the charge carriers in a material through the Hall effect. The interaction of magnetic fields in electric devices such as transformers is studied in the discipline of magnetic circuits.