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Bushong Ch 4 Test

Enter the letter for the matching Answer
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1.
An electric current is induced to flow in a circuit if some part of that circuit is in a changing magnetic field
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2.
Which electromagnetic device is defined as operating on the principle of mutual induction to change the magnitude of current and voltage
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3.
momentarily stores electric charge
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4.
Rubber and glass are examples of
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5.
The induced current flows in a direction such that it opposes the action that induces it
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6.
a small magnet created by the electron orbit
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7.
A transformer in which the current is decreased going from the primary side of the circuit to the secondary side would be an example of which of the following?
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8.
When a group of dipoles align, they create
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9.
An iron bar exposed to a strong magnetic field may become
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10.
True or False: Positive electric charges in a circuit flow from positive to negative
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11.
In a step-down transformer the current on the primary side is _________ than the secondary side
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12.
The magnetic field lines of a solenoid move in what direction
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13.
The charges on an electrified object are distributed
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14.
What type of electrification occurs when you touch a metal doorknob and you receive a shock
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15.
A coiled, current carrying helix is termed
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16.
T or F: The relationship of xray intensity to distance (inverse square law) is identical to Coulomb's law
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17.
imaginary field lines
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18.
What is the power rating of a lamp that carries 2A at 120 V
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19.
What is defined as the force needed to pass a current of 1 ampere thru a resistance of 1 ohm
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20.
Electrostatic force is ___________ proportional to the distance between charges, and __________ proportional to the product of the charges
A.
inversely, directly
B.
false
C.
smaller
D.
flux
E.
contact
F.
capacitor
G.
insulators
H.
step up transformer
I.
evenly throughout the object
J.
solenoid
K.
transformer
L.
240W
M.
from south to north
N.
true
O.
Lenz's law
P.
magnetic moment
Q.
a magnetic domain
R.
volt
S.
Faraday's law
T.
electromagnet
Type the Answer that corresponds to the displayed Question.
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21.
What happens to the current as resistance increases
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22.
Which principle in transformer operation determines whether the voltage will increase or decrease from the primary to secondary coils
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23.
The unit to measure electric current
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24.
weakly repelled from both poles of a magnetic field
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25.
Materials strongly attracted to magnets are termed
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26.
Alternating current is produced by a
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27.
Gadolinium is useful in MRI because it has which magnetic property
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28.
Like charges ___________ and unlike charges ____________.
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29.
True or False: The charges of an electrified object are concentrated only beneath the surface of the object.
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30.
What is a source of direct current

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