Test 7

Question 1

What is the rate of electric charge flow?

Answer 1

current

Question 2

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

Answer 2

pole

Question 3

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

Answer 3

electric charge increases

Question 4

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

Answer 4

parallel

Question 5

What moves when charge flows through an electrolyte?

Answer 5

ions

Question 6

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

Answer 6

proportionately

Question 7

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

Answer 7

decreases

Question 8

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

Answer 8

vertical

Question 9

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

Answer 9

induction

Question 10

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

Answer 10

same

Question 11

What is the Si unit of current?

Answer 11

ampere

Question 12

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

Answer 12

lines of flux

Question 13

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

Answer 13

increases

Question 14

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

Answer 14

power

Question 15

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

Answer 15

ferromagnetic

Question 16

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

Answer 16

magnetic equator

Question 17

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

Answer 17

quadruples

Question 18

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

Answer 18

fuse

Question 19

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

Answer 19

material

Question 20

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

Answer 20

magnetizing by induction

Question 21

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

Answer 21

repel

Question 22

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

Answer 22

the longer wire has greater resistance

Question 23

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

Answer 23

coercivity

Question 24

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

Answer 24

voltage

Question 25

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

Answer 25

load

Question 26

What kind of electric field has an equal strength throughout?

Answer 26

uniform

Question 27

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

Answer 27

deflecting

Question 28

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

Answer 28

magnetosphere

Question 29

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

Answer 29

neutral

Question 30

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

Answer 30

magnet

Question 31

What is the Si unit of resistance?

Answer 31

ohm

Question 32

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

Answer 32

Van Allen radiation belts

Question 33

material through which current does not easily flow

Answer 33

insulator

Question 34

material that allows current to flow through it with no resistance

Answer 34

superconductor

Question 35

electrical device designed to hinder current flow

Answer 35

resistor

Question 36

material through which current flows easily

Answer 36

conductor

Question 37

the Earth's "north-seeking" pole

Answer 37

south magnetic pole

Question 38

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

Answer 38

electroscope

Question 39

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

Answer 39

hard

Question 40

a device that opens or closes a circuit

Answer 40

switch

Question 41

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

Answer 41

closed

Question 42

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

Answer 42

permeability

Question 43

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

Answer 43

grounding

Question 44

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

Answer 44

Ohm's

Question 45

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

Answer 45

diamagnetic

Question 46

F=k qq/r^2

Answer 46

law of electric force

Question 47

V=IR

Answer 47

Ohm's law

Question 48

1/R= 1/R +1/R + 1/R ....

Answer 48

parallel circuit

Question 49

P= VI

Answer 49

power of electric current

Question 50

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

Answer 50

series

Question 51

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

Answer 51

domains

Question 52

R= R + R + R ....

Answer 52

series circuit