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ELECTRONICS > Part 2 Chapter 1 -Electricity and Magnetism > Flashcards

Part 2 Chapter 1 -Electricity and Magnetism Flashcards

1
Q

It is when attraction takes place

A

Magnetism

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2
Q

Magnetic Quantities

A
  1. Magnetic Flux
  2. Flux Density
  3. Magnetomotive Force
  4. Magnetic Field Intensity
  5. Reluctance
  6. Permeance
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3
Q

Counterpart of Current in Electricity

A

Magnetic Flux

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4
Q

Counterpart of Voltage in Electricity

A

Magnetomotive Force

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5
Q

Counterpart of Resistance in Electricity

A

Reluctance

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6
Q

Counterpart of Conductance in Electricity and also a reciprocal of Reluctance

A

Permeance

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7
Q

What is the Formula of Magnitude of Flux in a Surrounding Straight Conductor

A

Phi = 14x10^-8 I(l) log R/r

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8
Q

What is the Formula of Magnetic Flux Density

A

B = Magnetic Flux / Area

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9
Q

Discovered the relationship between magnetism and electricity that serves as the foundation for the theory of electromagnetism

A

Hans Christian Oersted

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10
Q

Demonstrated the theory of electromagnetic induction in 1831

A

Michael Faraday

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11
Q

Developed the electromagnetic theory of light in 1862

A

James clerk maxwell

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12
Q

He discovered that a current carrying conductor would moven when placed in a magnetic field

A

Michael Faraday

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13
Q

Discovered the most important electrical effects which is magnetic effect

A

Hans Christian Oersted

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14
Q

Demonstated that there are magnetic effects around every current carrying conductor and that current carrying conductor can attract and repel each other just like other magnets

A

Andre Ampere

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15
Q

Discovered superconductivity in 1911

A

Kamerlingh Onnes

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16
Q

Magnitude of the induced EMF in a coil is directly proportional to the rate of change of flux linkages

A

Faraday Second Law of Electromagnetic Induction

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17
Q

Whenever the flux linking a coil or current changes an emf is induced in it.

A

Faraday First Law of Electromagnetic Induction

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18
Q

The force pf attraction or repulsiob between two magnetic pole is directly proportional to their strenghts

A

Coulombs First Law

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19
Q

The force of attraction or repulsion between two poles is inversely proportional to the square of the distance between them.

A

Coulombs Second Law

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20
Q

Whenever a conductor cuts magnetic flux an EMF induced in it

A

Faraday’s Law

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21
Q

A Law that states the the POLARITY OF THE INDUCED VOLTAGE will oppose the change in magnetic flux causing the induction

A

Lenz Law

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22
Q

A law that states that the current in the thermionic diode varies directly with the three-halves power of anode voltage and inversely with the square of the distance between the electrodes, provided operating conditions are such that the current is limited only by the space charge

A

Child’s Law

23
Q

States that the ratio of the thermal conductivity to the electric conductivity is proportional to the absolute temperature for all metals

A

Wiedemann-Franz Law

24
Q

A law that establishing the fact that the algebraic sum of the rises and drops of the mmf around a closed loop of a magnetic circuit is equal to zero

A

Ampere’s Circuital Law

25
Q

The “net electric charge” in an “isolated system remains constant “

A

Law of Conservation of Charge

26
Q

Lenz law is the consequence of the law of conservation of

A

Energy

27
Q

Lenz law states that the direction of the induced emf and hence the current

A

Always oppose the cause producing it

28
Q

If you hold the conductor with right hand so that the stretched thumb points in the direction of the current then encircling fingers will give the direction of magnetic lines of force

A

Right Hand Rule

29
Q

If a right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in the direction of current flow , the motion of its handle will indicate the direction of magnetic flux produced around the conductor

A

Cork Screw Rule

30
Q

If on looking at any one END of a solenoid , the direction of current flow is found to be clockwise then the end under observation is a south pole this is known as

A

End Rule

31
Q

Is the solenoid is gripped by the right hand with the fingers pointing the direction of current flow, the outstretched thumb will then point the north pole

A

Helix Rule

32
Q

The process by which an emf and hence current is generated or induced when there is a change in the magnetic flux linking the conductor

A

Electromagnetic induction

33
Q

The emf induced in a coil due to the change of its own flux linked with it is called

A

Self Induced EMF

34
Q

The EMF induced in a coil due to the changing current of another

A

Mutually Induced EMF

35
Q

When a conductor is stationary and the magnetic field is moving or changing the emf induced is called

A

Statically Induced EMF

36
Q

The magnetic potential in a magnetic circuit can be measured in terms of

A

Magnetomotive force

37
Q

A substance that attracts pieces of irol

A

Magnet

38
Q

The phenomenon by which a substance attracts pieces of iron

A

Magnetism

39
Q

Which of the following is a natural magnet

A

Lodestone

40
Q

Defined as the pole which when placed in air from similar and equal poles repel it with a force of 1/4pi(uo) newtons

A

Unit Pole (k)

41
Q

The point in a magnet where the intensity of magnetic lines of force is maximum

A

Magnetic Pole

42
Q

The straight line passing through the poles of a magnet is called

A

Magnetic Axis

43
Q

The branch of engineering which deals with the magnetic effect of electric current is known as

A

Electromagnetism

44
Q

The space outside the magnet where its poles have a force of attraction or repulsion on a magnetic pole is called

A

Magnetic Field

45
Q

The total number of magnetic lines of force in a magnetic field is called

A

Magnetic Flux

46
Q

The phenomenon by which a magnetic substance becomes a magnet when it is placed near a magnet

A

Magnetic Induction

47
Q

Magnetic materials can be easily magnetized in both direction

A

Soft Magnetic Materials

48
Q

Which of the following materials has a permeability slightly less that that of free space

A

Diamagnetic

49
Q

Materials whose permeabilities are slightly greater than that of free space

A

Paramagnetic

50
Q

Materials that have very high permeabilities (hundreds and even thousand times that of free space)

A

Ferromagnetic

51
Q

The current of the electric circuit is analogous to which quantity of a magnetic circuit

A

Flux

52
Q

What is the diameter of an atom?

A

About 10^-10 m

53
Q

defined as a closed path in which magnetic induction or flux flows

A

Magnetic Ciruit

54
Q

the force which sets up or tends to set up magnetic flux in a magnetic circuit

A

magnetomotive force

ELECTRONICS (2 decks)

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