RPC L5

64問 • 1年前

問題一覧

discovered in Magnesia (West Turkey) - difficult to detect and measure - exists when there is a charged particle in motion

Magnetism

oxide of iron

Magnetite

rodlike stone that when suspended by a string would rotate back and forth

Lodestone

of a charged particle is perpendicular to its motion - also created when electric current/electrons is conducted through the wire - its intensity is proportional to the electric current - intensity is greatly increased by an iron core - Any charge in motion induces this

Magnetic field

motion of electrons rotating in a clockwise or counterclockwise axis - creates a magnetic field which is neutralized in electron pairs

Electron spin

lines of a magnetic field

Closed loops

Atoms with this number of electrons in any shell exhibit a very small magnetic field

Odd number

created by protons spinning on its axis that creates a magnetic dipole, basis for MRI

Magnetic moment

The accumulation of many atomic magnets with their dipoles aligned

Magnetic Domain

When all magnetic domains in an object are aligned, it acts like a what?

Magnet

in its normal state, magnetic domains are distributed in what way?

Randomly distributed

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

Magnetic permeability

When an external force acts on the magnetic domains, randomly oriented dipoles do what with the magnetic field?

Align

good example of a natural magnet

Earth

2 Types of Naturally Occurring Magnets

* Earth - has a magnetic field because it spins on its axis * Lodestones - exhibit strong magnetism presumably because they have remained undisturbed

Types of Artificially induced permanent magnets

* bar, horse-shaped made out of iron * Compass * Destroyed by: heating, hitting with hammer

* Consist of wire wrapped around an iron core * current-carrying coil of wire wrapped around an iron core which intensifies the induced magnetic field

Electromagnets

magnetic state that cannot be artificially magnetized

Diamagnetic

magnetic state that can be magnetized by exposure to a magnetic field.

Ferromagnetic

magnetic state that is slightly attracted to magnet and loosely influenced by an external magnetic field. Contrast agents used in MRI.

Paramagnetic

magnetic state unaffected by magnetic field

Nonmagnetic

degree to which a material can be magnetized is called this

Magnetic susceptibility

the ends of a magnet and are in pairs; the north and south pole.the ends of a magnet and are in pairs; the north and south pole.

Magnetic Poles

will create a magnetic field along its axis of spin.

Spinning charged particles

will create a magnetic field perpendicular to that particles motion.

Moving charged particle

some materials such as ferromagnetic materials can be made magnetic by this

Induction

imaginary lines of the magnetic field and its density is proportional to the intensity of the magnetic field

Magnetic lines of induction

who said this - Set out to show that electricity and magnetism are related. - Moving or spinning electric charges should induce a magnetic field. - Used an electric circuit and a compass to prove his experiment.

Hans Christian Oersted

who said this * 1st law of magnetic induction * An electric current is created in a circuit if some part of that circuit is in a changing magnetic field. * His experiments shows that magnetic fields can create electric currents * He showed the lines of a magnetic field by sprinkling iron filings on a piece of paper covering a magnet.

Michael Faraday (Faraday’s Law)

who said this? * 2nd law of magnetic induction * An induced current within a conductive coil produces a magnetic field to oppose the change in magnetic field which produced it

Lenz’s Law (Heinrich Friedrich Emil Lenz)

Who said this? * Proposed that if a changing magnetic field can induce an electric field, then a changing electric field should induce a magnetic field * Changing fields should move at a speed equal to the speed of light. * The magnetic force is proportional to the product of the magnetic pole strengths divided by the square of the distance between them.

James Clerk Maxwell

Sl unit of magnetic field strength

Tesla

conventional unit of magnetic field strength

Gauss

magnet used in an MRI system

3 Tesla

1 Tesla is equivalent to?

10,000 Gauss

The Earth's magnetic field is approximately what at the equator

50 uT

The Earth's magnetic field is approximately what at the poles

100uT

Electricity and Magnetism were viewed as separate effects until the?

19th Century

observed that a dissected frog leg twitched when touched by two different metals as if it had been touched by two different metals (late 1700s).

Luigi Galvani

who said this - questioned whether an electric current might be produced when two different metals are made into contact. - He succeeded in producing a feeble electric current using zinc and copper plates. - stacked the copper-zinc plates to form a Voltaic pile to increase the current.

Alessandro Volta

each zinc copper pile

Cell of a battery

what is precursor to the modern battery - paved the way to the creation of modern batteries which is an example of sources of electric potential.

Voltaic pile

modern dry cells use this as the positive electrode surrounded by an electrolytic paste housed in a negative zinc cylindrical can.

Carbon rods

electric potential is measured in units of joule per coulomb

Volts

The magnetic field produced by an electromagnet is the same as that produced by a bar of magnet

True

* An electric current is induced in a circuit if some part of that circuit is in a changing magnetic field. * No physical motion is needed. * If the current is increased in the electromagnet, the magnetic field will also change and induce a current in the coil

Electromagnetic Induction

What law states that the magnitude of the induced current depends on 4 factors: * Strength and the Velocity of the magnetic field as it moves past the conductor * The angle of the conductor in the magnetic field * Number of turns in the conductor

Faraday’s law

What motor possesses this * An electric current produces a mechanical motion. * Motion of the compass needle. * Has the same components as an electric generator. * Electric energy is supplied to the current loop to produce motion. * Uses many turns of wire for the current loop and many bars of magnets to create an external magnetic field

Electric Motors

what motor is this * Mechanical motion induces electricity in a coil of wire. * The motion of a magnet near a coil of wire. * A coil of wire is places in a strong magnetic field between two magnetic poles. * The coil is rotated by mechanical energy which in turn induces an electric current. * The net effect of an electric generator is to convert mechanical energy into electrical energy.

Electric Generators

What motor is this * The type of motor used in x-ray tubes. * The rotating rotor is a shaft made of bars of copper and soft iron fabricated into one mass. * The external magnetic field is supplied by several fixed electromagnets called Stators. * Powers the rotating anode of an x-ray tube.

Induction Motor

devices that uses the interacting magnetic fields produced by changing electric currents - does not convert but transforms electric potential and current into higher or lower intensity. - Operates in alternating current. - Has a primary turns of wire and a secondary turns of wire

Transformers

where input of electricity happens

Primary side

where output of electricity happens

Secondary side

If primary side has less turns of wire than the secondary side, the result will be this

Higher Voltage & Lower Current

the change in voltage is directly proportional to the ratio of the number of turns (windings) of the secondary coil (Ns) to the number of turns in the primary coil (Np)

Transformer Law (Voltage)

as the voltage changes across a transformer, the current changes also.

Transformer Law (Current)

Transformer that is * Built about a square core of ferromagnetic material. * The ferromagnetic core is not a single piece, but built up of laminated layers of iron. * Helps reduce energy losses, resulting to greater efficiency.

Closed core transformer

transformer that * Consist of an iron core with only one winding of wire about it. * The single winding acts as the primary and secondary winding. * Connections are made at different points on the coil for both the primary and secondary sides. * Varies both voltage and current. * Generally smaller and its use is restricted to cases in which a small step up or step down in voltage is required. * Not suitable for x-ray imaging.

Autotransformer

* Confines even more of the magnetic field lines of the primary winding because the secondary winding is wrapped around it and there are essentially two closed cores. * More efficient than closed-core transformer. * Most currently used transformer

Shell type transformer

Does not use a ferromagnetic core to link the primary and secondary coils.

Air-core transformer

Primary and Secondary coils are wound on one cylinder. Magnetic path is partially through the core and partially through the surrounding air

Open-core transformer

* A current that opposes the magnetic field that induced it creating a loss of transformer efficiency. * Closed-core transformer reduces this

Eddy Current

an additional resistance by alternate reversal of the magnetic field caused by alternating current.

Hysteresis Loss

* Electric current in the copper wire experience resistance. * Results in heat generation.

Resistance

physiology of circulation academic weaponizer

E · 24問 · 2年前

physiology of circulation academic weaponizer

24問 • 2年前

reproductive academic weaponizer

E · 55問 · 2年前

reproductive academic weaponizer

55問 • 2年前

cells prelim acad weaponizer

E · 24問 · 2年前

cells prelim acad weaponizer

24問 • 2年前

respiratory/body cavities prelim acad weaponizer

E · 20問 · 2年前

respiratory/body cavities prelim acad weaponizer

20問 • 2年前

integumentary prelim acad weaponizer

E · 29問 · 2年前

integumentary prelim acad weaponizer

29問 • 2年前

skeletal prelim acad weaponizer

E · 33問 · 2年前

skeletal prelim acad weaponizer

33問 • 2年前

tissue prelim acad weaponizer

E · 42問 · 2年前

tissue prelim acad weaponizer

42問 • 2年前

membrane prelim acad weaponizer

E · 20問 · 2年前

membrane prelim acad weaponizer

RPC L2

RPC L2

RPC L3

RPC L3

RPC L4

RPC L4

ALE

ALE

RPC M1

RPC M1

RPC M1/2

RPC M1/2

RPC M2

RPC M2

RPC M2.5

RPC M2.5

RPC M3

RPC M3

Midterm

Midterm

MIDTERM

MIDTERM

Midterm

Midterm

RPC F1

RPC F1

FINALS #1

FINALS #1

RPC F2

RPC F2

RPC F3

RPC F3

Finals

Finals

Prelim

Prelim

ISI FINALS PROLOGUE

ISI FINALS PROLOGUE

ISI FINALS EPILOGUE

ISI FINALS EPILOGUE

ISI FINALE

ISI FINALE

Chapter 3.5/4

Chapter 3.5/4

RADBIO 1&2

RADBIO 1&2

RADPRO 1&2

RADPRO 1&2

CHAPTER 4+1 NOT COMPLETE

E · 60問 · 1年前

CHAPTER 4+1 NOT COMPLETE

RADBIO 3

RADBIO 3

RADPRO 3

RADPRO 3

Chapter Left

Chapter Left

POI P1

POI P1

POI P2

POI P2

POI P3

POI P3

QUIZ 4 PART

QUIZ 4 PART

1-3

1-3

4 SECTION PUTA

4 SECTION PUTA

M1 K Ver

M1 K Ver

M2 K Ver

M2 K Ver

1-3

1-3

RAD BIO 4

RAD BIO 4

Awa

Awa

not parts

not parts

RADBIO & RADPRO 5

RADBIO & RADPRO 5

RADBIO & RADPRO 6

RADBIO & RADPRO 6

M4in

M4in

C5 Orig V1

C5 Orig V1

C5 Part 2

C5 Part 2

Urologic Procedures

Urologic Procedures

DRUGS

DRUGS

C5 Orig V2

C5 Orig V2

RAD BIO 7

RAD BIO 7

RAD BIO 8

RAD BIO 8

RAD PRO 6 & 7

RAD PRO 6 & 7

GI Procedures

GI Procedures

Compressed

Compressed

OMY TUBE

OMY TUBE

P2/3

P2/3

BREAST

BREAST

M1 PPT

M1 PPT

F1 Final

F1 Final

SPINE

SPINE

PRELIM FINALE

PRELIM FINALE

MIDTERM FINALE

MIDTERM FINALE

FINALS FINALE

FINALS FINALE

PPT4

PPT4

EXAM BASED

EXAM BASED

EXAM BASED

EXAM BASED

問題一覧

discovered in Magnesia (West Turkey) - difficult to detect and measure - exists when there is a charged particle in motion

Magnetism

oxide of iron

Magnetite

rodlike stone that when suspended by a string would rotate back and forth

Lodestone

Magnetic field

motion of electrons rotating in a clockwise or counterclockwise axis - creates a magnetic field which is neutralized in electron pairs

Electron spin

lines of a magnetic field

Closed loops

Atoms with this number of electrons in any shell exhibit a very small magnetic field

Odd number

created by protons spinning on its axis that creates a magnetic dipole, basis for MRI

Magnetic moment

The accumulation of many atomic magnets with their dipoles aligned

Magnetic Domain

When all magnetic domains in an object are aligned, it acts like a what?

Magnet

in its normal state, magnetic domains are distributed in what way?

Randomly distributed

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

Magnetic permeability

When an external force acts on the magnetic domains, randomly oriented dipoles do what with the magnetic field?

Align

good example of a natural magnet

Earth

2 Types of Naturally Occurring Magnets

* Earth - has a magnetic field because it spins on its axis * Lodestones - exhibit strong magnetism presumably because they have remained undisturbed

Types of Artificially induced permanent magnets

* bar, horse-shaped made out of iron * Compass * Destroyed by: heating, hitting with hammer

* Consist of wire wrapped around an iron core * current-carrying coil of wire wrapped around an iron core which intensifies the induced magnetic field

Electromagnets

magnetic state that cannot be artificially magnetized

Diamagnetic

magnetic state that can be magnetized by exposure to a magnetic field.

Ferromagnetic

magnetic state that is slightly attracted to magnet and loosely influenced by an external magnetic field. Contrast agents used in MRI.

Paramagnetic

magnetic state unaffected by magnetic field

Nonmagnetic

degree to which a material can be magnetized is called this

Magnetic susceptibility

the ends of a magnet and are in pairs; the north and south pole.the ends of a magnet and are in pairs; the north and south pole.

Magnetic Poles

will create a magnetic field along its axis of spin.

Spinning charged particles

will create a magnetic field perpendicular to that particles motion.

Moving charged particle

some materials such as ferromagnetic materials can be made magnetic by this

Induction

imaginary lines of the magnetic field and its density is proportional to the intensity of the magnetic field

Magnetic lines of induction

Hans Christian Oersted

Michael Faraday (Faraday’s Law)

who said this? * 2nd law of magnetic induction * An induced current within a conductive coil produces a magnetic field to oppose the change in magnetic field which produced it

Lenz’s Law (Heinrich Friedrich Emil Lenz)

James Clerk Maxwell

Sl unit of magnetic field strength

Tesla

conventional unit of magnetic field strength

Gauss

magnet used in an MRI system

3 Tesla

1 Tesla is equivalent to?

10,000 Gauss

The Earth's magnetic field is approximately what at the equator

50 uT

The Earth's magnetic field is approximately what at the poles

100uT

Electricity and Magnetism were viewed as separate effects until the?

19th Century

observed that a dissected frog leg twitched when touched by two different metals as if it had been touched by two different metals (late 1700s).

Luigi Galvani

Alessandro Volta

each zinc copper pile

Cell of a battery

what is precursor to the modern battery - paved the way to the creation of modern batteries which is an example of sources of electric potential.

Voltaic pile

modern dry cells use this as the positive electrode surrounded by an electrolytic paste housed in a negative zinc cylindrical can.

Carbon rods

electric potential is measured in units of joule per coulomb

Volts

The magnetic field produced by an electromagnet is the same as that produced by a bar of magnet

True

Electromagnetic Induction

Faraday’s law

Electric Motors

Electric Generators

Induction Motor

Transformers

where input of electricity happens

Primary side

where output of electricity happens

Secondary side

If primary side has less turns of wire than the secondary side, the result will be this

Higher Voltage & Lower Current

the change in voltage is directly proportional to the ratio of the number of turns (windings) of the secondary coil (Ns) to the number of turns in the primary coil (Np)

Transformer Law (Voltage)

as the voltage changes across a transformer, the current changes also.

Transformer Law (Current)

Closed core transformer

Autotransformer

Shell type transformer

Does not use a ferromagnetic core to link the primary and secondary coils.

Air-core transformer

Primary and Secondary coils are wound on one cylinder. Magnetic path is partially through the core and partially through the surrounding air

Open-core transformer

* A current that opposes the magnetic field that induced it creating a loss of transformer efficiency. * Closed-core transformer reduces this

Eddy Current

an additional resistance by alternate reversal of the magnetic field caused by alternating current.

Hysteresis Loss

* Electric current in the copper wire experience resistance. * Results in heat generation.

Resistance