![L 28 Electricity and Magnetism [6] Basic facts of Magnetism Induced](http://s1.studyres.com/store/data/001450251_1-3da8d040f51176abf8f36c3cf95f00b4-300x300.png)
L 28 Electricity and Magnetism [6] Basic facts of Magnetism Induced
... • Oersted discovered that a compass needle responded to the a current in a loop of wire • Ampere deduced the law describing how a magnetic field is produced by the current in a wire • magnetic field lines are always closed loops – no isolated magnetic poles; magnets always have a north and south pol ...
... • Oersted discovered that a compass needle responded to the a current in a loop of wire • Ampere deduced the law describing how a magnetic field is produced by the current in a wire • magnetic field lines are always closed loops – no isolated magnetic poles; magnets always have a north and south pol ...
Magnetism - Effingham County Schools
... Magnetic field lines describe the structure of magnetic fields in three dimensions.They are defined as follows. If at any point on such a line we place an ideal compass needle, free to turn in any direction (unlike the usual compass needle, which stays horizontal) then the needle will always point a ...
... Magnetic field lines describe the structure of magnetic fields in three dimensions.They are defined as follows. If at any point on such a line we place an ideal compass needle, free to turn in any direction (unlike the usual compass needle, which stays horizontal) then the needle will always point a ...
Practice Final P132 Spring 2004 9:30 section
... 2) Two point charges Qa and Qb are placed a distance d apart. The electric field is zero at a point P between the charges on a line segment connecting them. Which of the following is true? a) Qa and Qb must have the same magnitude and sign. b) Qa and Qb must have the same magnitude but different sig ...
... 2) Two point charges Qa and Qb are placed a distance d apart. The electric field is zero at a point P between the charges on a line segment connecting them. Which of the following is true? a) Qa and Qb must have the same magnitude and sign. b) Qa and Qb must have the same magnitude but different sig ...
Practice Final Exam
... 32. Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal point distance from the mirror? a. virtual, upright and magnification greater than one b. real, inverted and magnification less than one c. virtual, upright and mag ...
... 32. Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal point distance from the mirror? a. virtual, upright and magnification greater than one b. real, inverted and magnification less than one c. virtual, upright and mag ...
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.