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when we say a substance is magnetic. (HINT: Be sure to mention the role of the Electrons) If a substance is magnetic‚ we are actually saying that it is able to be acted upon by a magnetic field. When electricity flows through a circuit‚ it creates a magnetic field.When a magnet cuts across a circuit‚ a voltage is produced. 2. Discuss the relationship between electric and magnetic fields. (HINT: Be sure to discuss what happens when electric current is applied to a magnetic field.) The relationship
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Introduction The purpose of this lab is to examine the motion of an electron‚ when it encounters a constant magnetic and electric field. We will also observe when the electric field and magnetic field will cancel each other out. This will lead to the electron having no net force acting upon it. By adjusting the values for the magnetic and electric fields‚ we will be able to check the different paths the electron follows. From this data we will be able to calculate the charge-to-mass ratio. Then
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of the electron‚ in this case. After emerging from the hole in the anode‚ the electrons enter a region with no electric fields‚ therefore then traveling at a constant velocity. The beam’s path is illuminated due to the ionization of the gas. A magnetic field is applied to the beam using Helmholtz coils. Helmholtz coils are two vertically orientated‚ identical circular coils of wire (solenoids) that are placed parallel to each other‚ symmetric along a shared axis‚ one on each side of the domain
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realization that an electric current created a magnetic field around the conductor. It was then discovered that this effect could be enhanced greatly by winding the conductor into a coil. The effect proved to be two-way: If a conductor‚ maybe in the form of a coil was placed in a changing magnetic field‚ a current could be made to flow in it; this is called induction. So imagine a coil‚ and imagine that we apply a voltage to it. As current starts to flow‚ a magnetic field is created. But this means that
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following years‚ but it was not until the 1970’s that Japan and Germany showed interest in it and began researching and designing. The motion of the Maglev train is based purely on magnetism and magnetic fields. This magnetic field is produced by using high-powered electromagnets. By using magnetic fields‚ the Maglev train can be levitated above its track‚ or guide way‚ and propelled forward. Wheels and moving parts are eliminated on the Maglev train‚ allowing the Maglev train to essentially move
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consists of a loop that is able to rotate in a magnetic field. The electric motor uses electrical energy to make the loops rotate which creates mechanical energy. In the electric generator it uses mechanical energy to make the loops spin resulting in the creation of electric current within the loop. The way an electric generator functions is based on the principal of "electromagnetic induction". Electro magnetic induction is when you move a wire through a magnetic field causing electric current to enter
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3.3.3 In Class or Homework Exercise 1. The rectangular loop below is being pulled to the right‚ out of the magnetic field which points inward as shown. In what direction is the induced current? No current is induced in the top or bottom wire‚ since they are moving parallel to themselves. The only current induced is in the left wire‚ where the current is induced upward. The result will be a clockwise current. 2. If the solenoid below is being pulled away from the loop shown‚ in what direction
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rot E = - B/t (2) div B = 0 (3) div D = (4) Here rot (or curl in English literature) is the so called vortex density‚ H is vector of the magnetic field strength‚ j is the current density vector‚ D/t is the time derivative of the electric displacement vector D‚ E is the electric field strength‚ B/t is the time derivative of the magnetic induction vector B‚
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Electromagnets! An electromagnet is a type of magnet in which the magnetic field is produced by the flow of electric current. The magnetic field disappears when the current is turned off. Electromagnets are widely used as components of other electrical devices‚ such as motors‚ generators‚ relays‚ loudspeakers‚ hard disks‚ MRI machines‚ scientific instruments‚ and magnetic separation equipment‚ as well as being employed as industrial lifting electromagnets for picking up and moving heavy iron objects
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