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RADPROD > ELECTROMAGNETISM P1 > Flashcards

ELECTROMAGNETISM P1 Flashcards

1
Q

It is the set of phenomena associated with the presence and motion of matter that has the property of electric charge.

A

Electricity

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2
Q

It is the presence and flow (movement) of charge

• It is sometimes used to mean “electrical energy”

A

Electricity

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3
Q

• It is the basic property of matter carries by some elementary particles. It comes into two types: positive (+) and negative (-)

A

Electric Charge

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4
Q

are the smallest units of electric charge

A

Electrons and protons

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5
Q

has one unit of negative electric charge

A

Electron

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6
Q

has one unit of positive charge

A

Proton

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7
Q

T / F : Like Charges Repel and Unlike Charges Attract

A

TRUE

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8
Q

The unit of charge

A

Coulomb

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9
Q

named the Coulomb

A

Charles-Augustin de Coulomb

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10
Q

Value of Coulomb

A

= 6.24 x 10^18 electron charges

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11
Q

It states that “the electrical force between two charged objects is directly proportional to the product of the quantity of charge on the objects and inversely proportional to the square of the separation distance between the two objects”

A

Coulomb’s Law

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12
Q 
Where:
Fe = electric force
k = Coulomb constant (9 x 10^9 Nm^2 /C^2 )
q1 = charge on object 1
q2 = charge on object 2
r = distance between charges
A

Coulomb’s Law

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13
Q

k or Coulomb’s constant value

A

9 x 10^9 Nm^2 /C^2 )

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14
Q

• It is a force that acts at a distance, even when objects are not in contact with one another

A

Electrostatic force

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15
Q

means that one charge creates a field which in turn acts on the other charge

A

action at a distance

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16
Q

This provides a convenient graphical presentation of the electric field in space

A

Electric field lines

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17
Q

the direction of the field lines is radially inward

A

negative charge

18
Q

The direction of the field lines is radially outward

A

positive charge

19
Q

T / F : Direction of field lines for pair of charges of equal magnitude but the opposite sign (electric dipole)

A

TRUE

20
Q

Methods of Charging

A
  1. Friction
  2. Conduction
  3. Induction
21
Q

Occurs when two different materials rub against each other causing the transfer of electrons

A

Friction

22
Q

Occurs when a neutral object is placed in contact with an already charged object

A

Conduction

23
Q
  • A charged object is brought near but not touched to a neutral conducting object
A

Induction

24
Q

The presence of a charged object near a neutral conductor will force (or induce) electrons within the conductor to move

A

Induction

25
Q

Four (4) Electric States of Matter

A
  • Superconductor
  • Conductor
  • Semiconductor
  • Insulator
26
Q

No resistance to electron flow, no electric potential required, and must be very cold. The critical temperature usually between absolute zero and 10 Kelvin (-273 Celsius and -263 Celsius or as high as 125 Kelvin (-148 Celsius)

A

Superconductor

27
Q

are used in machines for nuclear magnetic resonance (NMR) in hospitals and in the orientation of the beam of a particle accelerator

A

Superconducting magnets

28
Q

A substance in which electrical charge carriers (usually electrons), move easily from atom to atom with the application of voltage • Includes copper, aluminum

A

Conductor

29
Q
  • It is a material that does not conduct electrical current

* These materials include paper, plastic, rubber, and glass

A

Insulator

30
Q

solid substance that has a conductivity between that of an insulator and that of most metals

A

Semi Conductor

31
Q

are essential components of most electronic circuits

A

silicon (Semi Conductor)

32
Q
  • It is defined as the electric potential energy, U , per unit charge
  • V = U/q
  • Sometimes referred to as the voltage
A

Electric potential (V)

33
Q

The higher the voltage, the greater the potential to do work

A

Electric potential (V)

34
Q
  • It is an electromotive force or potential difference expressed in volts
  • 1 V = 1 J/C
A

Voltage

35
Q

The Volt unit is named after _______________ an Italian physicist who invented an electric battery

A

Alessandro Volta

36
Q
  • It is the rate of flow of electrons in a wire.
  • SI Unit is Ampere (A)
  • 1 A is the flow of electric charge across a surface at the rate of 1C/s
A

Electric Current

37
Q

SI Unit is Ampere (A) which was named after?

A

Andre Marie Ampere

38
Q

• It is a measure of opposition to the flow of electric current

A

Electric Resistance

39
Q

inverse of Electric Resistance

A

electrical conductance

40
Q

SI UNIT of resistance?

A

Ohm (Ω),

41
Q

unit is Ohm (Ω), named after a German physicist and mathematician?

A

Georg Simon Ohm

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