Magnetic Fields are produced by the motion of electrons spinning around the nucleus and on their own axis. Every electron is a tiny electromagnet. A pair of electrons spinning in the same direction makes up a stronger electromagnet. A pair of electrons spinning in BACKGROUND opposite directions, however, work against each other. Their magnetic fields cancel. This why most substances are not magnets. In most atoms, the various fields cancel each other because the electrons spin in opposite directions. In materials such as iron, nickel, and cobalt, however, the fields do not cancel each other entirely. The magnetic field patterns for a pair of magnets is shown. The far left photo shows opposite poles nearest each other and the right photo shows like poles nearest each other Magnetic Fields pass undiminished through most materials, including many metals. But not iron. The magnetic field of individual iron atoms is so strong that interaction among adjacent atoms causes large clusters of them to line up with each other. These clusters of aligned atoms are called magnetic domains. Each domain is perfectly magnetized and made up of billions of aligned atoms. Use the reading to drag your red box over the correct answer for each of the following questions... The source of all Like kinds of magnetic Surrounding every Magnetism is due to Magnetic domains magnetism is... poles repel while moving electron is the motion of electrons normally occur in unlike kinds of as they magnetic poles Tiny pieces of iron Attract A magnetic field Move around the Iron Tiny domains of Repel An electric field nucleus Copper aligned atoms May attract or repel Both of these Spin on their axes Silver Ferromagnetic (depending on other Neither of these Both of these All of these materials factors) None of these None of these Moving electric charge None of theseAs the magnet on the right moves toward the magnet on the left (which is suspended by a string), what will the magnet on the left do? _ As the magnet on the right moves toward the magnet on the left (which is suspended by a string), what will the magnet on the left do? z , I , \\L\" For the magnet shown: \\ ' Where are the poles? ,d Where is the north pole? J/ Where is the south pole? 2 Magnetic Field: Permanent Magnets VIDEO in Canvas Screenshot YOUR WORK Physics Simulation: Magnetic Field Magnetic Field Game Permanent Magnets are made by placing pieces Click CK-12 to see other planet field lines of iron or iron alloys in strong magnetic fields. Alloys of iron differ, soft iron is easier to magnetize than steel. It helps to tap the iron to nudge any stubborn domains into alignment. Another way of making a permanent magnet is to stroke a piece of iron with a magnet. The stroking motion aligns the domains in the iron. If a permanent magnet is dropped or heated, some of the domains are jostled out of alignment and the magnet becomes weaker. Each of these magnetic field patterns are not correct, explain why... Unmagnetized iron IN Slightly magnetized iron Strongly magnetized iron When a magnet is broken into two pieces, each piece is an equally strong magnet3 Magnetic Field: Electromagnets VIDEO in Canvas SHOW YOUR WORK An electric current flow through a wire (shown below). Use the scribble icon to draw the magnetic field that the current generates. The picture shows a cross section of a wire carrying current straight out of the page. Use the scribble icon to draw the magnetic field that the wire generates. The picture shows an electromagnet with current flowing through it. Use the scribble icon to draw the magnetic field lines around it. What is the direction of the magnetic field. .. inside the loops: outside the loops: What is the direction and magnitude of the magnetic field at point A below, 0.03 meters from a wire that is carrying a current of 6.0 A? Ax 75$ FEIght H tiling B4197 I" SHOW YOUR WORK A proton travels to the right at a velocity ofdrO x 106 m/s through a magnetic field toward the top of the page. The strength of the magnetic field is 050 T' What is the magnitude and direction of the force acting on the proton? _ it a particle with charge +3e traveling at 3 x lDSm/s towards the top of the page enters a magnetic field of 2 '1' to the right, what is the magnitude and direction of the force? 5 3rd Right Hand Rule VIDEO in Canvas SHOW YOUR WORK A wire that is 625 m long is perpendicular to a 0.40-T magnetic field. A 1.8-N force acts on the wire. What current is in the wire? A uniform magnetic field of 0.25 T point into the page. A proton enters the field going to the right with a velocity of 4.0 x 10 m/s. What are the magnitude and direction of the instantaneous force exerted on the proton as it enters the magnetic field?6 Solenoids VIDEO in Canvas Which factor will not affect the strength of a solenoid? number of wraps strength of current thickness of wire core type X X X X x X +x XHow are magnets critical to our generation of electricity? (Hint: What is the only way we generate electricity without magnets?) Have a claim, evidence and reasoning