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    Physics Unit 6 Quizzes

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    William Gilbert
    The earliest ideas of charge were the result of experiments by:
    Common units of electrical force are:
    lack of electrons
    A positive charge means:
    are charged with respect to the earth
    Lightning is formed when clouds:
    the sea, air, metals
    Charges exist in:
    has essentially no free electrons
    An insulator is a material that:
    Charges may be transferred by:
    large quantities of charge
    A storage battery will conduct:
    An instrument to measure charge is called an electroscope.
    A _____ provides a steady flow of charge to the load connected to its terminals.
    In 1787, __________ discovered a relationship between charge, their separation, and the force between the two charges.
    repel; attract
    Coulomb’s law indicates that like charges ______ and unlike charges ______
    Coulomb’s law also indicates that the force between charges _______ as their separation is decreased.
    negative charge
    positive charge
    1. push or pull
    2. result of an excess of electrons
    3. result of a deficit of electrons
    4. object with abundant free electrons
    5. object with few free electrons
    wand contains relatively few free electrons, and the discharge period is short: the battery produces abundant charges and the discharge period is long
    The flow of electrical charge from a battery differs from discharging a glass wand because the:
    The force experienced by a unit test charge is a measure of the strength of an electric:
    unit positive test charge
    Conventionally, the field strength around a charged object is the direction of the force acting on a
    The force between two point charges is described by _____ law.
    The difference in _____________ between clouds and earth frequently gives rise to lightning.
    Oceanic electric fields produce electric currents
    The early experiments with static charges were done by:
    A negatively-charged object has an excess of
    The force between charged objects decreases when their separation
    1 N
    If the force is 4 newtons between two charged spheres separated by 3 centimeters, calculate the force between the same spheres separated by 6 centimeters.
    1 N/C
    Calculate the electric field strength where a test charge of 2 coulombs is repelled by a force of 2 newtons.
    outer electrons of elements in good conductors are loosely held and are able to migrate readily
    What characteristic does a good conductor possess?
    unit positive
    By definition the direction of a field vector is the direction of the force on a ______ charge.
    A device that stores electric energy is a
    An electric field produces the tendency for a charge to do work. This tendency is called
    The flow of electric charge is called current.
    The unit of current is the
    Law of Conservation of Charge
    The fact that electric charges return to the source of the current is an example of:
    The region around a charged object is an electric _____.
    An example of a natural electric field is
    does not
    A type of material that __ conduct charges is an insulator.
    A deficit of electrons produces a ____ charge.
    Mass is equal to charge.
    Newton’s law of gravitational attraction has the same form as Coulomb’s law.
    Potentials and electric fields both result from electrical charges
    A battery is a chemical storage container producing electrical potential.
    Oceans do not have electric currents
    Both the field and the potential between two charged parallel plates are due to charges on the plates.
    The charge on a capacitor can be discharged by connecting the plates with an insulator.
    2,400 V/m
    Calculate the electric field strength between two parallel plates separated by 0.50 cm, across which is a potential of 12 volts.
    17 N/C
    Calculate the electric field strength at a point at which a test charge of 0.30 coulombs experiences a force of 5.0 newtons.
    4 N
    Calculate the mutual force of repulsion between two charged spheres 2 cm apart if the repulsive force for a 1 cm separation is 16 N.
    A region of space in which a test charge experiences a force is a(n):
    Any material possessing loosely held electrons that are free and capable of movements is a(n):

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