Lecture 13 - UConn Physics
... Magnesia, a district in northern Greece – or maybe it comes from a shepherd named Magnes who got the stuff stuck to the nails in his shoes ...
... Magnesia, a district in northern Greece – or maybe it comes from a shepherd named Magnes who got the stuff stuck to the nails in his shoes ...
Document
... Suppose you have one permanent bar magnet and another bar-shaped object that is attracted to the magnet but not repelled. Imagine that you do not know which object is the magnet. Using only these two objects, find a way to determine which object is the permanent magnet. (Hint: Are there parts on eit ...
... Suppose you have one permanent bar magnet and another bar-shaped object that is attracted to the magnet but not repelled. Imagine that you do not know which object is the magnet. Using only these two objects, find a way to determine which object is the permanent magnet. (Hint: Are there parts on eit ...
Magnetic Field Lines
... Magnetic Field (B) • The magnetic field (B) is defined as a vector with both direction and magnitude (strength) that varies with both position and distance from a magnetic pole. • In this case, the magnetic field of the magnet exerts a force on the iron rods within the Demonstrator which causes them ...
... Magnetic Field (B) • The magnetic field (B) is defined as a vector with both direction and magnitude (strength) that varies with both position and distance from a magnetic pole. • In this case, the magnetic field of the magnet exerts a force on the iron rods within the Demonstrator which causes them ...
Magnets and Magnetism
... Suppose you have one permanent bar magnet and another bar-shaped object that is attracted to the magnet but not repelled. Imagine that you do not know which object is the magnet. Using only these two objects, find a way to determine which object is the permanent magnet. (Hint: Are there parts on eit ...
... Suppose you have one permanent bar magnet and another bar-shaped object that is attracted to the magnet but not repelled. Imagine that you do not know which object is the magnet. Using only these two objects, find a way to determine which object is the permanent magnet. (Hint: Are there parts on eit ...
il "ferrofluido" ha quelle caratteristiche di comportamento
... rub it with your hands very carefully, picking up the gray powder that comes off the steel wool. This powder is still too heterogeneous for the experiment, it's necessary to filter it. So, collect the filings in a glass or in a beaker, cover the opening with tights which act as a filter. By turning ...
... rub it with your hands very carefully, picking up the gray powder that comes off the steel wool. This powder is still too heterogeneous for the experiment, it's necessary to filter it. So, collect the filings in a glass or in a beaker, cover the opening with tights which act as a filter. By turning ...
Baby-Quiz
... 1. Which of the following affects the resistance of a wire: diameter, type of material, length, or temperature? Explain. 2. Which circuit offers the greater resistance to to battery, two bulbs in series or two bulbs in parallel? Why? 3. If a string of five bulbs in series is added in parallel to a s ...
... 1. Which of the following affects the resistance of a wire: diameter, type of material, length, or temperature? Explain. 2. Which circuit offers the greater resistance to to battery, two bulbs in series or two bulbs in parallel? Why? 3. If a string of five bulbs in series is added in parallel to a s ...
Induction AP/IB
... • When an emf is generated by a change in magnetic flux according to Faraday's Law, the polarity of the induced emf is such that it produces a current whose magnetic field opposes the change which produces it. • The induced magnetic field inside any loop of wire always acts to keep the magnetic flux ...
... • When an emf is generated by a change in magnetic flux according to Faraday's Law, the polarity of the induced emf is such that it produces a current whose magnetic field opposes the change which produces it. • The induced magnetic field inside any loop of wire always acts to keep the magnetic flux ...
Discussion 10
... poles attract each other, equal poles repel each other. -A "hard" or "permanent" magnet is one that stays Lecture demos: magnetized, such as the rock “loadstone” or iron -Load stone (ferromagnet). -Bar magnet -A "soft" or "impermanent" magnet is one that loses its -Broken magnet memory of previous m ...
... poles attract each other, equal poles repel each other. -A "hard" or "permanent" magnet is one that stays Lecture demos: magnetized, such as the rock “loadstone” or iron -Load stone (ferromagnet). -Bar magnet -A "soft" or "impermanent" magnet is one that loses its -Broken magnet memory of previous m ...
Discussion 11
... poles attract each other, equal poles repel each other. -A "hard" or "permanent" magnet is one that stays Lecture demos: magnetized, such as the rock “loadstone” or iron -Load stone (ferromagnet). -Bar magnet -A "soft" or "impermanent" magnet is one that loses its -Broken magnet memory of previous m ...
... poles attract each other, equal poles repel each other. -A "hard" or "permanent" magnet is one that stays Lecture demos: magnetized, such as the rock “loadstone” or iron -Load stone (ferromagnet). -Bar magnet -A "soft" or "impermanent" magnet is one that loses its -Broken magnet memory of previous m ...
Reading Guide CH 28KEYJWW
... No. It must “induce” (create) a magnetic field from the door’s surface. Only surfaces made of ferromagnetic materials. ...
... No. It must “induce” (create) a magnetic field from the door’s surface. Only surfaces made of ferromagnetic materials. ...
Chapter 25 - Senior Physics
... • Diamagnetic substances, which are very weakly repelled by magnets. This class, in fact, includes most substances. Examples of diamagnetic materials include glass and the metals copper, gold, and bismuth. • Paramagnetic substances, which are very weakly attracted by magnets. Examples include the me ...
... • Diamagnetic substances, which are very weakly repelled by magnets. This class, in fact, includes most substances. Examples of diamagnetic materials include glass and the metals copper, gold, and bismuth. • Paramagnetic substances, which are very weakly attracted by magnets. Examples include the me ...
![L 28 Electricity and Magnetism [5]](http://s1.studyres.com/store/data/001652997_1-39b0ac23a2b50856ca07ac04d66ac502-300x300.png)
![L 28 Electricity and Magnetism [5]](http://s1.studyres.com/store/data/001468655_1-12c2495c0c6eb4c679cede08941ae4d1-300x300.png)
6. Magnetism
... Each acts like tiny magnet Generally, domains cancel – no magnetic effects An external field aligns domains (non-random) A strong magnetic field can make other ferromagnetic materials into permanent magnets ...
... Each acts like tiny magnet Generally, domains cancel – no magnetic effects An external field aligns domains (non-random) A strong magnetic field can make other ferromagnetic materials into permanent magnets ...
magnetic dipole
... The use of a compass might suggest that the Earth has a strong magnetic field, but it does not. The Earth's magnetic field is approximately 50 μT at the equator and 100 μT at the poles. This is far less than the magnet on a cabinet door latch, which is approximately 100 mT. ...
... The use of a compass might suggest that the Earth has a strong magnetic field, but it does not. The Earth's magnetic field is approximately 50 μT at the equator and 100 μT at the poles. This is far less than the magnet on a cabinet door latch, which is approximately 100 mT. ...
Ivan Lomachenkov
... Ivan Lomachenkov The electromagnetic rotation of water The rotation of water in magnetic and electrical fields demonstrates the effect of a magnetic force on charged particles. It’s a simple equipment. ...
... Ivan Lomachenkov The electromagnetic rotation of water The rotation of water in magnetic and electrical fields demonstrates the effect of a magnetic force on charged particles. It’s a simple equipment. ...
Ivan Lomachenkov
... • It’s not difficult to estimate the radial velocity of the ions of Na. The result is vr~ I/n, I- the current, n- the concentration of the ions. For the current I~ 0.1 A we have vr~ 10-7m/s. • We can also estimate the circular component of the velocity: v~ nvrB/, where - the viscosity of the sol ...
... • It’s not difficult to estimate the radial velocity of the ions of Na. The result is vr~ I/n, I- the current, n- the concentration of the ions. For the current I~ 0.1 A we have vr~ 10-7m/s. • We can also estimate the circular component of the velocity: v~ nvrB/, where - the viscosity of the sol ...
Magnetism and electromagnetism How are magnetic poles
... 2nd left hand rule – (for a coiled wire) If you point your ________ in the direction the electrons are moving around the coil, then your ____________ will point to the magnetic __________ pole. The rule changes to a right hand rule if current instead of electron flow is known because current is oppo ...
... 2nd left hand rule – (for a coiled wire) If you point your ________ in the direction the electrons are moving around the coil, then your ____________ will point to the magnetic __________ pole. The rule changes to a right hand rule if current instead of electron flow is known because current is oppo ...
Magnet
A magnet (from Greek μαγνήτις λίθος magnḗtis líthos, ""Magnesian stone"") is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, and attracts or repels other magnets.A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include iron, nickel, cobalt, some alloys of rare earth metals, and some naturally occurring minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond weakly to a magnetic field, by one of several other types of magnetism.Ferromagnetic materials can be divided into magnetically ""soft"" materials like annealed iron, which can be magnetized but do not tend to stay magnetized, and magnetically ""hard"" materials, which do. Permanent magnets are made from ""hard"" ferromagnetic materials such as alnico and ferrite that are subjected to special processing in a powerful magnetic field during manufacture, to align their internal microcrystalline structure, making them very hard to demagnetize. To demagnetize a saturated magnet, a certain magnetic field must be applied, and this threshold depends on coercivity of the respective material. ""Hard"" materials have high coercivity, whereas ""soft"" materials have low coercivity.An electromagnet is made from a coil of wire that acts as a magnet when an electric current passes through it but stops being a magnet when the current stops. Often, the coil is wrapped around a core of ""soft"" ferromagnetic material such as steel, which greatly enhances the magnetic field produced by the coil.The overall strength of a magnet is measured by its magnetic moment or, alternatively, the total magnetic flux it produces. The local strength of magnetism in a material is measured by its magnetization.