Download Physics 30 Forces and Fields Concept Check 15

Physics 30 Forces and Fields Concept Check 15 Concept:
describe magnetic interactions in terms of forces and fields
1.
How is it possible for a compass to point north?
2.
What direction are the field lines pointing at the equator and at our location?
3.
How is it possible for the north end of a magnet to attract a non-magnetized paper
clip?
Concept:
compare gravitational, electric and magnetic fields (caused by permanent
magnets and moving charges) in terms of their sources and directions
4.
What shape do magnetic field lines make? How does this shape compare to that of
electric and gravitational fields?
5.
How do you determine the direction of a magnetic field? The direction of a
gravitational field? The direction of an electric field?
6.
What is the range of each of the three fields (magnetic, electric, gravitational)?
7.
What produces a gravitational field? What produces an electric field? What
produces a magnetic field?
Concept:
describe how the discoveries of Oersted and Faraday form the foundation
of the theory relating electricity to magnetism
8.
How did Oersted’s and Faraday’s experiments shape our understanding of
magnetism?
•
describe, qualitatively, a moving charge as the source of a magnetic field and predict
the orientation of the magnetic field from the direction of motion
9.
What field is produced around a stationary electrical charge?
10. What field is produced around a moving electrical charge?
11. Describe the direction of the magnetic field of electron moving out of the page
towards you?
12. A conductor has a current moving out of the page. Describe the direction of the
magnetic field around this conductor.
13. Is the magnetic field shown below correct for this cross section of a solenoid?
14. Explain how an electromagnet could be made more powerful.
•
explain, qualitatively and quantitatively, how a uniform magnetic field affects a
moving electric charge, using the relationships among charge, motion, field direction
and strength, when motion and field directions are mutually perpendicular
15. Describe the path that a charged particle travels when moving parallel to magnetic
field lines.
16. Describe the path that a charged particle travels when moving parallel to magnetic
field lines.
17. Which direction is the magnetic force that acts on a charged particle moving in a
magnetic field directed? Describe how to determine the direction of the magnetic
force.
18. A proton is accelerated through a potential difference of 3000 V. It enters a
magnetic field of 0.030 T. What is the radius of curvature of the proton?
http://www.who.int/peh-­‐emf/about/WhatisEMF/en/ http://www.gridnewzealand.co.nz/f63,57681/EMF-­‐fact-­‐sheet-­‐3-­‐2009.pdf