* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download o t p a4
Magnetosphere of Jupiter wikipedia , lookup
Maxwell's equations wikipedia , lookup
Geomagnetic storm wikipedia , lookup
Friction-plate electromagnetic couplings wikipedia , lookup
Magnetosphere of Saturn wikipedia , lookup
Mathematical descriptions of the electromagnetic field wikipedia , lookup
Edward Sabine wikipedia , lookup
Electromagnetism wikipedia , lookup
Magnetic stripe card wikipedia , lookup
Lorentz force wikipedia , lookup
Neutron magnetic moment wikipedia , lookup
Magnetometer wikipedia , lookup
Magnetic nanoparticles wikipedia , lookup
Giant magnetoresistance wikipedia , lookup
Magnetic field wikipedia , lookup
Magnetic monopole wikipedia , lookup
Electromagnetic field wikipedia , lookup
Earth's magnetic field wikipedia , lookup
Magnetotellurics wikipedia , lookup
Magnetotactic bacteria wikipedia , lookup
Superconducting magnet wikipedia , lookup
Magnetohydrodynamics wikipedia , lookup
Multiferroics wikipedia , lookup
Magnetoreception wikipedia , lookup
Electromagnet wikipedia , lookup
Magnetochemistry wikipedia , lookup
Force between magnets wikipedia , lookup
Ktt€osteUo: Magnetism 1 We Live in 1.1 Compare and Contrast a Magnetic Field Electrostatic vs. Magnetic Interactions (Sec 36.1) Fill in the table that follows to indicate how magnetic poles are different from or the same as positively or negatively charged objects. The north pole ofabar magnet always attracts the south pole of another bar magnet and repels cA the tb(kO-1 Lj e 0 p tp o f Lv - Jr other bar’s north pole. N pole nor the south Neither the poleofamagnetexertsaforceona small aluminum ball hanging at the end of a thin, non-conducting thread. north n, ( - ‘v:’ A foam tube is charged by rubbing so that one end is positive and the OJt’ other negative. You find that both ends attract the north pole of a bar magnet (and the south pole) is Lt 11i ‘-‘ r I 1 ‘V “ is positively charged on one end and negatively charged on the end into half, one rod will stay positively charged, the other rod wIll stay negatively charged. fl When you cut a rod that - cAp0. -, : Electrostatic Interaction Magnetic Interaction What property of objects determine whether they participate in the interaction? What is the direction of the force between the interacting objects? a4 Isolation of properties (+) charges and (-) charges cannot be isolated. - I 4 North pole and south pole can cannOt be isolated. 1 stello: Magnetism 1 12 Observe and Sketch Draw the following in the appropriate space provided. a Pattern of iron filings with bar magnet b. Pattern of compasses surrounding bar magnet c. Pattern of iron filings: North vs. South pole d. Pattern of iron filings: South vs. South pole e. Find a pattern: Where do the lines” start? Where do they end? How do you know? f. Are there any similarities or differences between the lines created by iron filings vs. the direction of the compasses? 2 osteflo: Magnetism 1 g. A horseshoe magnet is simply a bar magnet that has been bent so that the north and south poles are near each other. Make a sketch of how the iron filing pattern might look. V — - —-- — Magnetic field lines: A magnetic field can be represented with magnetic field lines. They have the following properties (Sec 36.2): • The direction of the magnetIc field line at a point is the same direction as the magnetic field at that point and end on • The magnetic field lines start on i,V. Th • The magnitude of the field at a point is represented by the density or concentration of the lines near that point. • The number of lines leaving or terminating on a charged object is proportional to the magnitude of its pole. • Magnetic field lines NEVER cross. • Magnetic field lines are strongest 3 astello: Magnetism 1 N S 1.3 Sketch Draw the appropriate magnetic field lines for the following diagram (Sec 36.2 and 365): b. North pole north pole a. Horseshoe magnet - I I [s j, N j N \ d. South pole south pole c. South pole north pole - - / t:ifj ri — y / f. Current-carrying wire e. Current-carrying wire / d J 0 ‘ md 4 1o: Magnetism 1 1.4 How are magnetic fields produced? (Sec. 36.3) a) Produced by I t[ (the motion of electric Ok charge) b) Electrons In the atom are in constant motion. The two kinds of electron motion are: cMc Lt The main contributor to magnetism is t most common magnets. c) Every spinning electron is a tiny magnet in I • A pair of electrons spinning in the same direction: • A pair of electrons spinning in opposite directions: 1’ d) In materials such as iron, cobalt and nickel, the fields 1.5 Magnetic Domains (Sect. 36.4) a) Magnetic domains: clusters of magnetically aligned atoms b) For the iron to be magnetic, the magnetic domain must be c) Why are most objects not magnetic? d) How are permanent magnets made? () (b FIG. 627. Magnetic domains h a ierromagnetic solid. (a) flan. dom damains when unmagnetized. (b) Parailet alignment of do mains as a result of an external magnetic field. e) Why do magnets get weaker when dropped or heated? Homewotk: Read Sections 36.6-36.9. Answer Check Concepts Questions (pg 735 and 736) 11-20. 5 — jbS JE 4 S ‘a. 4’ :k %‘. . SS e I a St a p.,.. 4 S * .5 • .5 5 *5