Chapters 22-24 Flashcards
A material which readily transmits current is called a(n)…..
conductor
Pg. 328
A production of charge by the influence of another charged body at a distance is called …..
induction
Pg. 330
Magnetizing a material by bringing it into the presence of an existing magnet is called magnetization by …..
induction
Pg. 342
The law of magnetic force was formulated by …..
Coulomb
Pg. 343
Materials which are strongly attracted by magnets are said to be ……
ferromagnetic
Pg. 347
Magnetic induction can be measured in any of the following units except …..
Magnetic induction can be measured in:
T(tesla) =N/A•m
T= Wb/m^2
Pg. 352, 355
The generation of current in a conductor moving in a magnetic field is called …..
electromagnetic induction
Pg. 359
Which of the following did Faraday not demonstrate by thrusting a bar magnet into a coil?
Faraday did demonstrate:
1. The mere presence of a magnetic field is not enough to induce current within a coil.
2. Current is induced within a coil by relative motion between the coil and a magnetic field.
3. The speed of the relative motion between a coil and a magnetic field determines how much current is produced.
4. The current induced by a magnetic field depends on the strength of the field.
5. The current varies directly with the number of turns in the coil.
Pg. 362
A device that produces current by electromagnetic induction is called a(n) …..
electromagnetic generator
Pg. 366
Completion
A(n) ….. is used for testing the charge of an object.
electroscope
Pg. 331
The only available charge carriers in a solid material are …..
electrons
Pg. 328
Any piece of magnetized rock is known as a(n) …..
lodestone
Pg. 341
When neighboring atomic dipoles orient themselves in the same direction and spread this orientation to other atoms a(n) ….. is formed.
domain
Pg. 346
When current flows through a liquid, ….. are the carriers of electrical charge.
atoms
Pg. 328
The SI unit of magnetic induction is the …..
Tesla
Pg. 344
A positive electrode of an electrochemical cell is called a(n) …..
cathode
Pg. 373
A device in which two conductors come together at junctions but are maintained at different temperatures is called a(n) …..
thermocouple
Pg. 375
A ….. crystal produces a potential difference between its opposite faces when a mechanical stress is applied to it.
piezoelectric
Pg. 376
….. law states that induced current is directed so as to create a magnetic field that opposes the motion causing the current.
Lenz’s
Pg. 365
True/False
The total charge on any insulated object or insulated system of connected objects is (conserved).
True
Pg. 333
Lines of (flux) always originate in a positively charged body and terminate in a negatively charged body.
force
Pg. 334
All charge is confined to the (surface) of a conductor.
True
Pg. 338
Any charge on a (cubical) conductor is distributed uniformly over the exterior surface.
spherical
Pg. 338
The material of a (permanent) magnet is easily magnetized and easily demagnetized.
temporary
Pg. 343
(Decreasing) the temperature of a magnet destroys its ability to retain its magnetization.
Increasing
Pg. 342
The needle of Oersted’s compass experiment moved when current was turned on or off in a wire running (parallel) to the original direction of the needle.
True
Pg. 348
One difference between AC and DC generators is that an (AC) generator has a commutator.
DC
Pg. 368
Electrochemical cells connected together constitute a (battery).
True
Pg. 374
The voltage of cells in series is the (sum) of their separate voltages.
True
Pg. 374
Matching
coulomb current Electric field strength Electric potential Electric potential energy Voltage
The force exerted on a charge
Amount of work done in transporting total charge from the ground to a specified point
Amount of work done by an external force to move a unit of positive charge from point A to point B on a conductor
The total charge of 6.242 X 10 ^18 electrons
Matching
coulomb current Electric field strength Electric potential Electric potential energy Voltage
The force exerted on a charge = electric field strength
Amount of work done in transporting total charge from the ground to a specified point = electric potential energy
Amount of work done by an external force to move a unit of positive charge from point A to point B on a conductor = electric potential difference
The total charge of 6.242 X 10 ^18 electrons = coulombs
Equations
Calculates the magnetic force on a straight conductor
F= BI(L) Magnetic force B= magnetic induction I= carrying current I Lowercase L for length
Pg. 352
Pg. 352
Equation
Calculates the magnetic force on a moving charge
F= qvB Magnetic force q= charge's magnitude B = magnetic induction Pg. 354
Short answer
Describe how an insulated, grounded metal sphere can be given a lasting positive charge by induction
An insulated, grounded metal sphere can be given a lasting positive charge through induction by holding a negatively charged rubber rod near the metal sphere; and the sphere will acquire a positive charge to counteract the negative charged rod near it. Once a positive charge is gained by the sphere the charge will stay even after the connection to the ground is broken and the rod is removed from its vicinity.
Pg. 330
Describe how you can find the direction of magnetic force on moving charges by using the left-hand three-finger rule
With your left hand, point your thumb in the direction of negative current; your extended, straight index finger points in the direction of magnetic induction, and your bent middle finger shows the direction of magnetic force.
Pg. 353
Name two ways we can increase the frequency of the current produced by an AC generator.
Two ways to increase the frequency of the current produced by an AC generator is by rotating the armature faster or by increasing the number of magnetic poles surrounding the armature.
Pg. 368
