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Practice Test
: Physics Vocab Ch. 36-37
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superconducting electromagnet
magnetic domains
step-up transformer
Faraday's Law
How do you use the curl hand rule
When do you use the Flat Hand Rule
Why is earth a magnet?
For finding the direction of the magnetic force acting on a charge moving across a magnetic field
arrangement of greater number of turns on the secondary than on the primary
Don't really know. Could be molten currents beneath crust, moving charges. or convection currents combined with rotational effects of the earth.
microscopic cluster of atoms with their magnetic fields aligned, domains perfectly magnetized
Thumb along the wire, curl fingers around wire to find direction of magnetic field, compass needle with point in that direction, tangent to the field lines
The induced voltage in a coil is proportional to the product of the number of loops and the rate at which the magnetic field changes within these loops. or: An electric field is created in any region of space in which a magnetic field is changing with time. The magnitude of the created electric field is proportional to the rate at which the magnetic field changes. The direction of the created electric field is at right angles to the changing magnetic field.
generate powerful magnetic field indefinitely without using any power. Use superconducting wire instead of iron.
Short Answer
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magnetic poles
What is the motor effect?
Amount of voltage produced by electromagnetic induction
Does the earth's magnetic field change?
Measures current
Multiple Choice
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How do you make a magnet?
Hold a strong magnet up to it for a very long time until the domains align. Helps to tap, stroke or nudge because helps to align domains.
microscopic cluster of atoms with their magnetic fields aligned, domains perfectly magnetized
The induced voltage in a coil is proportional to the product of the number of loops and the rate at which the magnetic field changes within these loops. or: An electric field is created in any region of space in which a magnetic field is changing with time. The magnitude of the created electric field is proportional to the rate at which the magnetic field changes. The direction of the created electric field is at right angles to the changing magnetic field.
Experiences a deflecting force. Greatest when particle perpendicular to magnetic field lines, zero when parallel to magnetic field lines. Direction of force perpendicular to both magnetic field and velocity of charged particle.
galvanometer
Why does the current in a transformer intensify if you put a magnet through the primary and secondary loops
Flow of positive charge, even though does not flow. Old rule. Use right hand.
Alignment of magnetic domains in the iron, and the concentration of the magnetic field in the core
end that points south
Connected to armature, produces its rotation.
X
What creates a magnetic field?
end that points south
Moving electric charges
Moving charges experience a force that is perpendicualr to both their motion and the magnetic field they traverse. Stationary wire and magnet.
Vibrating electric and magnetic fields that regenerate each other. Electric field perpendicular to magnetic field.
Primary
current-carrying coil of wire with many loops
Input, coils connected to a power source.
For finding the direction of the circular magnetic field around a current-carrying wire
Vibrating electric and magnetic fields that regenerate each other. Electric field perpendicular to magnetic field.
Flow of positive charge, even though does not flow. Old rule. Use right hand.
Maxwell's law
rate at which energy is transferred
Output, connected to a galvanometer
A magnetic field is created in any region of space in which an electric field is changing with time. The magnitude of the created magnetic field is proportional to the rate at which the electric field changes. The direction of the created magnetic field is at right angles to the changing electric field.
lines that reveal the shape of a magnetic field. Direction: from north to south pole. Lines closer together indicate stronger field.
phenomenon of inducing voltage by changing magnetic field around a conductor
True or False
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How does the law of conservation of energy hold true in electromagnetic induction
brush against stationary contacts
True
False
magnetic field lines
lines that reveal the shape of a magnetic field. Direction: from north to south pole. Lines closer together indicate stronger field.
True
False
How fast does an electromagnetic wave move?
Hold a strong magnet up to it for a very long time until the domains align. Helps to tap, stroke or nudge because helps to align domains.
True
False
Relative motion
Only thing that electromagnetic induction depends on. Doesn't matter whether magnet or wire moves, either.
True
False
When is the curl hand rule used?
For finding the direction of the circular magnetic field around a current-carrying wire
True
False
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Practice Test: Physics Vocab Ch. 36-37