Chpt 5 Part 3

Question 1

branch of physics that deals with electricity and magnetism and the relationship between them

Answer 1

electromagnetism

Question 2

(T/F) Electricity and magnetism are different aspects of the same force

Answer 2

True

Question 3

Who proved that every electrical current (moving charge) produces an associated magnetic field

Answer 3

Oersted (1820)

Question 4

What was Oersted’s experiment?

Answer 4

Set up a long wire that was supported near a free-rotating compass

Question 5

What did the magnet do when no current was passed through, and when current was turned on? (Oersted Experiment)

Answer 5

No current = magnet pointed North
current = magnet pointed toward the wire

Question 6

Oersted’s experiment provided evidence of what and that it was possible to do what to the Earth’s magnetic field?

Answer 6

• electromagnetism
• able to “override”

Question 7

Who developed rules to determine the direction of the magnetic field around a current-carrying conductor?

Answer 7

John Fleming

Question 8

(T/F) The flow of current and the flow of electrons are in the same direction

Answer 8

False
- opposite directions

Question 9

( o ) thumb is toward you or away from you?
( x ) thumb is toward you or away from you?

Answer 9

• Toward you
• Away from you

Question 10

Right hand represents what?
Left hand?

Answer 10

Right = current
Left = electron flow

Question 11

Thumb represents what?
fingers?

Answer 11

Thumb = current flow
Fingers = direction of the magnetic field

Question 12

A coil of wire

Answer 12

Solenoid

Question 13

What does a solenoid become when current passes through it?

Answer 13

a magnet

Question 14

The ability of a material to attract the lines of magnetic field intensity

Answer 14

permeability core

Question 15

(T/F) a solenoid will produce a strong magnetic field

Answer 15

true

Question 16

current carrying coil of wire wrapped around an iron core, which intensifies the magnetic field

Answer 16

electromagnet

Question 17

The strength of the magnetic field is determined by what three things?

Answer 17

• number of loops / turns of wire
• strength of the current (battery)
• permeability of the core material

Question 18

(T/F) a current moving through a conductor will produce a magnetic field

Answer 18

true

Question 19

a magnetic field moving over a what can induce an electrical current in it

Answer 19

conductor

Question 20

Who determined that the magnetic lines of force and the wire must have a motion relative to each other to induce an electrical current

Answer 20

Faraday (1821)

Question 21

3 ways to create motion between the conductor and the magnetic field to induce electrical current

Answer 21

• move the conductor through a stationary magnetic field
• move the lines of force without changing the field strength
• vary the magnetic field strength

Question 22

whenever a conductor cuts across the magnetic flux or when a conductor is cut by a magnetic field, what is induced in the conductor?

Answer 22

electromotive force (emf) or potential difference

Question 23

the interaction of one life of force and one loop of conductor is called?

Answer 23

flux linkage

Question 24

the magnitude of the induced emf is determined by what?

Answer 24

by the number of flux linkages per second

Question 25

4 factors that influence the magnitude of induced emf (Faraday's law or first law of electrodynamics)

Answer 25

- strength of the magnetic field - speed of the motion - angle - number of loops/coils

Question 26

the stronger the magnetic field the ______ the flux lines are, therefore the ____ flux lines that are cut (flux linkages) per second. The _____ the induced emf

Answer 26

closer together more more

Question 27

the faster the conductor is traveling the ___ flux linkages per second

Answer 27

more

Question 28

The closer to ___ degrees the more flux linkages per second

Answer 28

90