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26 Cards in this Set
- Front
- Back
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Magnetic poles exert _____ or _____ forces on each other.
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a. attractive
b. repulsive |
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A permanent magnet will always have a ______ and ________.
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a. north pole
b. south pole |
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Magnetism can be induced in ____.
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Iron
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Soft magnetic materials such as ______, are easily _______, but tend to easily _______ their magnetized.
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a. Iron
b. magnetized c. lose |
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Hard magnetic materials such _____ and _____ are difficult to magnetize, but tend to retain their ________.
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a. cobalt
b. nickel c. magnetism |
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Electric fields surrounds any stationary _______.
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electric charge
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The region of space surrounding a moving charge is a _____.
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magnetic field
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Magnetic fields surround properly magnetized ________ material.
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magnetic
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To define a vector field ______, _____, and _______ is needed.
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a. magnitude
b. strength c. direction |
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____ is defined as the direction of a magnetic field.
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B
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Describe what the direction of magnetic field, B, encompasses.
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B at any location is the direction in which the north pole of a compass needle points at that location.
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How are forensic scientists able to find fingerprints? Describe the relationship between iron power and perspiration and brush.
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Power iron is put on the surfaces where the fingerprint is, the iron adheres to the oil or liquid from the fingerprint. A brush is used to spread the magnetic pieces.
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The geographic North Pole of Earth corresponds to a magnetic _____ pole, and the geographic South pole corresponds to a magnetic _______ pole.
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-south
-north |
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The difference between true north and geographic north; and true south and geographic south is
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magnetic declination
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Although the earth has large deposits of iron ore in its surfaces, but its true magnetic field source is the electric current in the
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liquid part of the earth's core.
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The earth's magnetic field reverses its direction reverses
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every few million years.
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Birds use the magnetic field lines for
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migration
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________ are able to align with Earth's magnetic field after they find themselves in _____ environments.
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a. Magnetic bacteria
b. oxygen |
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Describe what the direction of magnetic field, B, encompasses.
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B at any location is the direction in which the north pole of a compass needle points at that location.
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How are forensic scientists able to find fingerprints? Describe the relationship between iron power and perspiration and brush.
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Power iron is put on the surfaces where the fingerprint is, the iron adheres to the oil or liquid from the fingerprint. A brush is used to spread the magnetic pieces.
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The geographic North Pole of Earth corresponds to a magnetic _____ pole, and the geographic South pole corresponds to a magnetic _______ pole.
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-south
-north |
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The difference between true north and geographic north; and true south and geographic south is
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magnetic declination
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|
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Although the earth has large deposits of iron ore in its surfaces, but its true magnetic field source is the electric current in the
|
liquid part of the earth's core.
|
|
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The earth's magnetic field reverses its direction reverses
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every few million years.
|
|
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Birds use the magnetic field lines for
|
migration
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________ are able to align with Earth's magnetic field after they find themselves in _____ environments.
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a. Magnetic bacteria
b. oxygen |
