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Abeka Physical Science > Test 7 > Flashcards

Test 7 Flashcards

1
Q

What is the rate of electric charge flow?

A

current

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2
Q

What is the region of concentrated magnetism at the end of a magnet?

A

pole

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3
Q

A balloon is rubbed with a wool cloth and sticks to a wall. Why can the balloon stick to the wall?

A

electric charge increases

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4
Q

The reciprocal of the total resistance of a _______ circuit equals the sum of the reciprocals of the resistance of the individual resistors.

A

parallel

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5
Q

What moves when charge flows through an electrolyte?

A

ions

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6
Q

Changing the charge of one object ___________ changes the attraction or repulsion between it and another object.

A

proportionately

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7
Q

What happens to resistance as the diameter of a conductor increases?

A

decreases

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8
Q

What is the orientation of the lines of flux when the inclination at the magnetic poles is 90 degrees?

A

vertical

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9
Q

What process imparts electric charge at a distance without direct contact between objects?

A

induction

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10
Q

In a parallel circuit, the voltage of each branch must be the ______ as the voltage of the circuit as a whole.

A

same

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11
Q

What is the Si unit of current?

A

ampere

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12
Q

What are used to indicate the direction and strength of a magnetic field?

A

lines of flux

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13
Q

What happens to the total current flowing in a parallel circuit when more branches are added?

A

increases

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14
Q

What value equals the product of voltage and current in an electric current?

A

power

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15
Q

What term describes a substance that has several unpaired electrons per atom and is strongly attracted to magnets?

A

ferromagnetic

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16
Q

What is the imaginary line that circles Earth halfway between the two magnetic poles?

A

magnetic equator

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17
Q

An electromagnet’s coil has 50 loops. What will happen to the strength of the electromagnet if another 50 loops are added?

A

quadruples

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18
Q

What circuit-protection device uses a narrow strip of metal to prevent excessive current through a circuit?

A

fuse

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19
Q

What is the most important factor affecting the ease of current flow through a wire?

A

material

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20
Q

What method of magnetism is used when a needle is magnetized by holding a magnet near the needle?

A

magnetizing by induction

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21
Q

How do two like charges interact when they are brought close to each other?

A

repel

22
Q

If one wire is twice as long as another wire that is otherwise identical, what is true about their resistance?

A

the longer wire has greater resistance

23
Q

Which of the following is the resistance of a magnet to being demagnetized by another magnetic field?

A

coercivity

24
Q

What is the work per unit charge done to move electric charges between different parts of an electric field?

A

voltage

25
Q

What device transforms the energy of an electric current into another useful form of energy?

A

load

26
Q

What kind of electric field has an equal strength throughout?

A

uniform

27
Q

What force causes an electric charge moving through a magnetic field to deviate from its original path?

A

deflecting

28
Q

What is the extent of a planet’s magnetic field in space?

A

magnetosphere

29
Q

What term describes an object with an equal number of positive and negative charges?

A

neutral

30
Q

What is an object capable of attracting materials by a magnetic force?

A

magnet

31
Q

What is the Si unit of resistance?

A

ohm

32
Q

What are the two belts of charged particles located above Earth’s equator that protect Earth from the solar wind?

A

Van Allen radiation belts

33
Q

material through which current does not easily flow

A

insulator

34
Q

material that allows current to flow through it with no resistance

A

superconductor

35
Q

electrical device designed to hinder current flow

A

resistor

36
Q

material through which current flows easily

A

conductor

37
Q

the Earth’s “north-seeking” pole

A

south magnetic pole

38
Q

A simple device that uses the laws of electrostatics to detect small electric charges

A

electroscope

39
Q

A material whose domains strongly resist changes in the direction of its magnetic field is described as magnetically ______.

A

hard

40
Q

a device that opens or closes a circuit

A

switch

41
Q

A circuit that contains a complete path for electrons to flow through is a(n) ______ circuit.

A

closed

42
Q

The extent to which a material can absorb or channel lines of flux is _________.

A

permeability

43
Q

The process of diverting unwanted electric charge directly into the earth is ______.

A

grounding

44
Q

The law that relates current, voltage, and resistance is ____ law.

A

Ohm’s

45
Q

A substance that has no unpaired electrons and is slightly repelled by either pole of a magnet is a _______ substance.

A

diamagnetic

46
Q

F=k qq/r^2

A

law of electric force

47
Q

V=IR

A

Ohm’s law

48
Q

1/R= 1/R +1/R + 1/R ….

A

parallel circuit

49
Q

P= VI

A

power of electric current

50
Q

In a _____ circuit, added bulbs increase total resistance, but in a parallel circuit, added bulbs decrease total resistance.

A

series

51
Q

If a magnet is cut in half to separate the poles, ______ align to make a north and a south pole on both halves.

A

domains

52
Q

R= R + R + R ….

A

series circuit

Abeka Physical Science (9 decks)

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