Arbitrary shaped wire I 均匀磁场中任意曲线导体
... We have studied the M forces exerted on 1) moving charges 2) currentcarrying wire 3) current loop by a uniform M field. In1819, Oersted found an electric current in a wire deflected a nearby ...
... We have studied the M forces exerted on 1) moving charges 2) currentcarrying wire 3) current loop by a uniform M field. In1819, Oersted found an electric current in a wire deflected a nearby ...
Lab 6 Magnetism and Electromagnetism - Galileo
... poles obey the inverse-square law, and his results were confirmed by Charles Coulomb. The subjects of magnetism and electricity developed almost independently of each other until 1820, when a Danish physicist named Hans Christian Oersted discovered, in a classroom demonstration, that an electric cur ...
... poles obey the inverse-square law, and his results were confirmed by Charles Coulomb. The subjects of magnetism and electricity developed almost independently of each other until 1820, when a Danish physicist named Hans Christian Oersted discovered, in a classroom demonstration, that an electric cur ...
magnetic effects of electric current
... Magnetising a material. When a material is placed inside a coil carrying current, it will get magnetized. A bunch of nails ore a iron rod placed along the axis of the coil can be magnetized by the current allowed to pass through the coil. Once the current is put-off the magnetic field will also be l ...
... Magnetising a material. When a material is placed inside a coil carrying current, it will get magnetized. A bunch of nails ore a iron rod placed along the axis of the coil can be magnetized by the current allowed to pass through the coil. Once the current is put-off the magnetic field will also be l ...
UNIT B - apel slice
... Why do these plastic letters stick to this refrigerator door? Distance affects the strength of a magnet's attraction. A small steel object that is close to a magnet moves toward it. However, if the same object is farther away, it will not move toward the magnet. Other forces can overcome the force o ...
... Why do these plastic letters stick to this refrigerator door? Distance affects the strength of a magnet's attraction. A small steel object that is close to a magnet moves toward it. However, if the same object is farther away, it will not move toward the magnet. Other forces can overcome the force o ...
Document
... currents produces a torque on the disk, and turns it. A spring exerts a restoring torque on the disk so that the angular deflection is proportional to the angular velocity of the magnet. ...
... currents produces a torque on the disk, and turns it. A spring exerts a restoring torque on the disk so that the angular deflection is proportional to the angular velocity of the magnet. ...
Physics 132 Prof. Douglass Schumacher Introductory Physics:
... From the demonstrations it appears we must conclude: • A non-contact force can exist between currents, and it’s not the gravitational or electric force. • A force can exist between a magnet and a current. We guessed (correctly, it turns out) that the force between currents is also magnetic. Currents ...
... From the demonstrations it appears we must conclude: • A non-contact force can exist between currents, and it’s not the gravitational or electric force. • A force can exist between a magnet and a current. We guessed (correctly, it turns out) that the force between currents is also magnetic. Currents ...
click to
... we are only interested in the component of D normal (orthogonal or perpendicular) to the surface S. We write this as Dn. The tangential component Dt flows along the surface. If we imagine the D field as a water flow, then only the component Dn would contribute to water actually leaving the volume - ...
... we are only interested in the component of D normal (orthogonal or perpendicular) to the surface S. We write this as Dn. The tangential component Dt flows along the surface. If we imagine the D field as a water flow, then only the component Dn would contribute to water actually leaving the volume - ...
references
... Based on the combination of classical fluid mechanics and theory of electromagnetism, this work studies the flow pattern of a magnetic fluid in an annular space under the influence of an external magnetic field based on a computational study using FLUENT 6.2.16. In the annular space, there filled a ...
... Based on the combination of classical fluid mechanics and theory of electromagnetism, this work studies the flow pattern of a magnetic fluid in an annular space under the influence of an external magnetic field based on a computational study using FLUENT 6.2.16. In the annular space, there filled a ...
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.