Physics Chapter 5 Test Review
Terms in this set (53)
Lenz's Law state the the induced B field will have a polarity to...
Oppose the B field of the magenet that induced it.
The phenomenon of inducing volatile by moving the magnetic field around a conductor is called...
The principle advantage if AC over DC is that...
AC can be easily transformed
A device consisting of a coil that is not mechanically rotated in a stationary magnetic field is called...
Electric current can be best induced in a wire by...
Moving the magnet up and down near the wire
A magnet is moved in and out of a coil of wire. The number of coils doubled, it is more difficult to move the magnet. This illustrates...
The AC in the secondary coil of a transformer is induced by....
A moving magnetic field
Which conversion process is the basic function of the electric motor...
Electrical energy to mechanical energy
Magnetic field line surrounding a magnet are conventionally drawn...
From north to south
The source of all magnetism is
Moving electric charges
In a drawing of magnetic lines of force the stronger the field is
The closer together the lines of force are
Which geographic pole of the earth is nearest the magnetic north pole of the earth
The reason a magnet can attract and unmagnetized nail is that
Nails become temporarily magnetized in a magnetic field
And iron rod becomes magnetic when
The Net spins of its electrons point in the same direction
Which orientation characterizes the magnetic domain in a non-magnetize piece of iron
A drawing of the lines of force of a magnetic field provides information on
Both the direction in the magnitude of the field
Which best describes magnetic declination
The angle between the geographic north and magnetic south poles
What is the direction of the force on an electron that is traveling to the right in a magnetic field that is directed out this page
Up the page
The hand rule used for the direction of the force on a charged particle in a magnetic field applies
To both positive and negative charges
Which force field to accelerate and electron but never change speed
The force of an electron moving in a B field will be largest when its direction
Is perpendicular to the B field direction
A charged particle moves perpendicularly throw B field the effect of the field is to change the particles
B fields do not interact with
Stationary electric charges
A wire carrying a current is bent into a loop. the magnetic field is strongest
Within the loop
A current in a long, straight wire produces a magnetic field. These magnetic field lines
Form circles that pass around the wire
A coil of wires
A transformer cannot
Increase or decrease power
Earths magnetic feild goes...
Geographic South to geographic North or magnetic north to magnetic south
If you move a magnetic field it will create a current
A speaker is
Used electromagnetic induction to turn mechanical energy into electrical energy
In the second right hand rule, the index finger
Is the direction of the particle or it's velocity
In the second right hand rule, the thumb is
The force (or Fm in the equation)
In the second right hand rule, the fingers are
The b field (or B in the equation)
Bullets are when
The force/direction/b feild is coming out of the page
Feathers are when
Force/direction/B feild is going into the page
In Fm=qvB, 'q' represents
Charge in coulombs
In Fm=qvB, 'v' represents
In Fm=BIL, I represents
The current in amps
In Fm=BIL, L represents
The length of the wire in meters
If you cut a magnet in half...
You have two smaller magnets
Substances that can be magnetized
Cause earths magnetic poles
Things needed to make an electromagnet
Ferromagnetic core, a battery, a wire
Lenz's Law is based on
The conservation of energy
Where are primary and secondary parts on a transformer
Primary on the right, secondary on the left
You can create more voltage by moving the b field faster and moving it into and out of more coils of wire
A magnet that retains its magnetic properties in the absence of an inducing field or current.
Temporary magnets have their atoms aligned only while under the influence of a strong external magnetic field
Is a generator
First right hand rule the thumb is
The direction of the current or I
In the first right hand rule the way the fingers are wraped represent
The direction of the B-field and whether or not it is going in or out of the page