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Electric Motor
Electric Motor

2010S exam 3
2010S exam 3

... current exerts on the electron? (Assume that the current runs left to right and the electron is below the wire.) ...
OPTION 140-50 Current Coil
OPTION 140-50 Current Coil

Lesson 2 Magnetism Notes File
Lesson 2 Magnetism Notes File

Project Sheet 1
Project Sheet 1

... two magnets together, they will repel each other. If you hold the North (N) and the South (S) poles of two magnets together, they attract each other with a strong force. Just like protons and electrons, opposites attract. It is by using these special properties of magnets that we are able to make el ...
College Physics, PHYS 104, Behavioral Objectives, Unit III (b)
College Physics, PHYS 104, Behavioral Objectives, Unit III (b)

PHY2054 Fall 2012 Exam 2 Solutions 1. Resistors of values 8.0 Ω
PHY2054 Fall 2012 Exam 2 Solutions 1. Resistors of values 8.0 Ω

... E. none of the above is correct. A non magnetic bar will not produce the Faraday effect phenomena and will drop faster. With the north pole down, the field below the magnet is downwards and increasing as the magnet falls. It will be counteracted by an induced field pointed upwards. The current for t ...
time of completion
time of completion

... Different sets of equations are possible depending on the choice of currents and loops. One example is below: (I1 is in the leftmost branch, downward. I2 is in the central branch, downward, I3 is in the rightmost branch, downward.) Left loop – counterclockwise direction, right loop – counterclockwi ...
Applications
Applications

... Îelectric currents produce magnetic fields (Ampere) Îmagnetic field lines are always closed loops • permanent magnets: the currents are atomic currents – due to electrons spinning in atomsthese currents are always there • electromagnets: the currents flow through wires and require a power source, e. ...
Current in a transformer
Current in a transformer

Homework 6: Magnets - Login Page for Xphysics
Homework 6: Magnets - Login Page for Xphysics

... north pole of a magnet or not! ) 4. The diagram below shows an electromagnet with a variable resistor in the circuit to vary the current flowing through it. An ammeter is included to measure the current. A large compass has its needle deflected by the electromagnet. ...
What is Magnetism?
What is Magnetism?

... necklaces, and even Write your name on the top bracelets. Unfortunately, I only have one big magnet left, but I need to make 3 different pieces of magnetic jewelry. Since I only make money if my jewelry is magnetic, I was wondering if breaking the big magnet into smaller pieces will damage the magne ...
Notes - 8 - Transformers
Notes - 8 - Transformers

Electro-magnetic flow meters
Electro-magnetic flow meters

... voltage is proportional to the rate of change of flux. Consider also how useful this integration method is in practical inductor design; if you know the number of turns on a winding and the voltage waveform on it then you integrate with regard to time and voilá you have found the amount of flux. Wha ...
B - college physics
B - college physics

... Click to see each of the following: Effective current of electrons Magnetic force on electron Charge separation in rod Orientation of electric field Electric force on electrons ...
Exam review slides WITH SOLUTIONS
Exam review slides WITH SOLUTIONS

Unit 08 Induction and Lenz`s Law
Unit 08 Induction and Lenz`s Law

Chapter 19 Magnetism and Electromagnetism
Chapter 19 Magnetism and Electromagnetism

(www.efficientacademy.com)-ISC Physics Sample Paper 7
(www.efficientacademy.com)-ISC Physics Sample Paper 7

... c) Two electric bulbs are marked 220V., 60 W and 220 V, 100 W. Which bulb has more ...
Practice exam with answers
Practice exam with answers

... A) The net magnetic force on the wire rectangle is upward, and there is also a net torque on the it. B) The net magnetic force on the wire rectangle is zero, and the net torque on it is zero. C) The net magnetic force on the wire rectangle is downward, and there is also a net torque on the it. D) Th ...
Part 2
Part 2

... Currents Induced currents can flow in bulk material as well as through wires. These are called eddy currents, and can dramatically slow a conductor moving into or out of a magnetic field. ...
Slide 1
Slide 1

Time Varying Electric and Magnetic Fields
Time Varying Electric and Magnetic Fields

transformer
transformer

Electromagnetism
Electromagnetism

< 1 ... 122 123 124 125 126 127 128 129 130 ... 153 >

Magnetic core

A magnetic core is a piece of magnetic material with a high permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies. It is made of ferromagnetic metal such as iron, or ferrimagnetic compounds such as ferrites. The high permeability, relative to the surrounding air, causes the magnetic field lines to be concentrated in the core material. The magnetic field is often created by a coil of wire around the core that carries a current. The presence of the core can increase the magnetic field of a coil by a factor of several thousand over what it would be without the core.The use of a magnetic core can enormously concentrate the strength and increase the effect of magnetic fields produced by electric currents and permanent magnets. The properties of a device will depend crucially on the following factors: the geometry of the magnetic core. the amount of air gap in the magnetic circuit. the properties of the core material (especially permeability and hysteresis). the operating temperature of the core. whether the core is laminated to reduce eddy currents.In many applications it is undesirable for the core to retain magnetization when the applied field is removed. This property, called hysteresis can cause energy losses in applications such as transformers. Therefore, 'soft' magnetic materials with low hysteresis, such as silicon steel, rather than the 'hard' magnetic materials used for permanent magnets, are usually used in cores.
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