Physics CP Final Exam Review Packet ­ Magnetism Physics CP Final Exam Review Packet Magnetism
1.
The magnetic force is attractive / repulsive / either attractive or repulsive. (circle one) 2. Magnetism is caused by _________________ in motion. 3.
When there is a net movement of charge in an atom, an atomic ____________ is created and the atom behaves like a mini­magnet. 4. What is a magnetic domain? 5.
6.
The three most ferromagnetic elements are ___________, ___________, & __________. Why do most ferromagnetic materials have no overall magnetic field? Explain in terms of magnetic domains. 7.
What is magnetite? Where can it be found? 8.
Rocks containing large amounts of magnetite are called ___________________. Ancient civilizations used these objects for ______________________. 9.
TRUE OR FALSE? Any type of metal can be used to make a permanent magnet. ______ 10. Wrapping an insulated, current­carrying wire around a nail is one way of making an _____________________________. 11. EVERYTHING is affected by magnetic fields, even people. What modern medical technique uses magnetic fields to diagnose patients? _________ 12. Like poles __________. Opposite poles ____________. 13. You break a single bar magnet in half. What do the poles on the broken pieces look like? Draw a before and after picture. 14. The magnetic field around a magnet is the strongest near the ____________. 15. OUTSIDE the magnet, magnetic field lines point from _________ to _________. INSIDE the magnet, magnetic field lines point from _________ to _________. 16. Diagram the magnetic field for the following combinations of bar magnets: N S S N S N
S N 17. Earth’s magnetic field is generated by movements of _____________ _____________ in the ____________ ___________? Diagram Earth’s magnetic field below. Indicate the location of Earth’s North and South poles (both geographic and magnetic). Use Ng , N m
S g, & S m
, . axis of rotation 18. Earth’s magnetic field protect us from cosmic radiation called ___________ _________. When this radiation interacted with Earth’s magnetic field and atmosphere, it produces the natural phenomena called ___________________. 19. What has happened to Earth’s magnetic field in the past? What do scientists believe will happen to Earth’s magnetic field in the future? What experimental evidence support these claims? 20. About how many years are there between field reversals? __________________ 21. What is a compass? 22. Explain why the north pole of a compass needle points in a “northward” direction. 23. What is the shape of the magnetic field generated by a long, straight, current­carrying wire? 24. The strength of the magnetic field generated by a solenoid coil can be increased by a.
___________________ the number of coils. b. Increasing the ________________ through the wire. c.
Placing a _____________________ material in the center of the solenoid. 25. In a cathode ray tube (CRT), an applied magnetic field exerts a force on a beam of charged particles. This causes the beam of particles to ___________________.