Ch 24: Magnetism Flashcards
Magnetic poles and ________ _______ share some similar behavior, but they are not the same.
electric charges
The end of a magnet that point north is called the _____ ____.
north pole
If the north pole of one magnet is brought near the north pole of another magnet, they _____ ____ _____.
repel each other
Cutting a bar magnet in half produces…
…two weaker but still complete magnets, each with a north and south pole.
If an object is attracted to one pole of a magnet, it is also attracted to the _____ ____.
other pole
Most materials, including ______, ________, _____, and _______ experience no force from a magnet.
copper, aluminum, glass, and plastic
The magnetic field of a magnet points ______ from the north pole and ______ the south pole.
away
toward
Magnetic field lines go from a _____ magnetic pole to a _____ magnetic pole.
north
south
The north pole is represented by the color _____ and the south by the color _____.
red
white
A bar magnet that is free to pivot – a compass – always swings so that its north pole points geographically north, however, we just established that the magnetic field of a magnet points away from the north pole and toward the south pole.
Explain this phenomenon!
The south pole of the earth’s magnet is located near (but not exactly at) the same place as the north GEOGRAPHIC pole of the earth, and vice versa.
A compass truly behaves like all other magnets and will point at the south pole of another magnet.
The earth’s magnetic field has components both parallel to the ground (horizontal) and perpendicular to the ground (vertical). An ordinary north-pointing compass (only 2-D) responds to only the horizontal component of the field, but a compass free to rotate in 3 dimensions would tilt ________ as well.
downward
Where is the earth’s magnetic field nearly parallel to the ground?
at the equator
p. 843
What is the dip angle?
the angle (of the magnetic field lines) from the horizontal
What type of bacteria have strongly magnetized bits of iron in their bodies?
magnetotactic bacteria
Two wires carrying currents in the same direction are __________ to one another, while two wires carrying currents going in opposite directions are __________ by one another (with equal but opposite forces per unit length).
attracted
repelled
p. 859
