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Electricity and Magnetism > E&M: Fundamentals > Flashcards

E&M: Fundamentals Flashcards

1
Q

What is the diameter of an atom?

A

10^-10 m

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2
Q

The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages. This is known as

A

Faraday’s second law of electromagnetic induction

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3
Q

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

A

Coulomb’s second law

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4
Q

The net electrical charge in an isolated system remains constant. This is known as

A

Law of conservation of charge

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5
Q

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

A

Magnetic pole

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6
Q

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

A

Self induced emf

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7
Q

If 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. This is known as

A

Helix rule

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8
Q

The phenomenon by which a substance attracts pieces of iron

A

Magnetism

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9
Q

A law that states that the current in a 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

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10
Q

Who developed the electromagnetic theory of light in 1862?

A

James Clerk Maxwell

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11
Q

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

A

Magnetic field

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12
Q

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

A

Wiedemann Franz law

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13
Q

Materials whose permeabilities are slightly greater than that of free space

A

Paramagnetic

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14
Q

Who 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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15
Q

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

A

Ferromagnetic

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16
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

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17
Q

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

A

Magnetic axis

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18
Q

Who discovered the most important electrical effects which is the magnetic effect?

A

Hans Christian Oersted

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19
Q

Define as that pole which when placed in air from a similar and equal pole repels it with a force of newtons

A

Unit pole

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20
Q

Referred to as the specific reluctance of a material

A

Reluctivity

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21
Q

Which of the following magnetic materials can be easily magnetized in both direction?

A

Soft magnetic materials

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22
Q

The force which set ups or tends to set up magnetic flux in a magnetic circuit

A

Magnetomotive force

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23
Q

A law 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

24
Q

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

A

Magnetic induction

25
Q

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

A

Mmf

26
Q

Which of the following is NOT a property of acids?

A. Taste sour
B. Feel slippery on the skin
C. Turn litmus paper to red
D. Dissolve metals producing various salts and hydrogen gas

A

Feel slippery on the skin

27
Q

Which of the following is NOT a property of bases?

A. Feel slippery on the skin
B. Turn litmus paper to blue
C. Taste bitter
D. Dissolve metals producing various salts and hydrogen gas

A

Dissolve metals producing various salts and hydrogen gas

28
Q

An acid can react with base to produce a __________.

A

salt

29
Q

Vinegar is a solution of water and what kind of acid?

A

Acetic acid

30
Q

What acid is added to carbonated drinks to produce a tart test?

A

Phosphoric acid

31
Q

Table salt or sodium chloride may be formed by the reaction of:

A

Hydrochloric acid and sodium hydroxide

32
Q

What occurs when a substance is transformed into another substance with a totally different composition and properties?

A

Chemical change

33
Q

What occurs when a substance changes it appearance without changing its composition?

A

Physical change

34
Q

What is another term for “chemical change”?

A

Chemical reaction

35
Q

A material is said to be ______ if its composition and properties are uniform throughout.

A

homogeneous

36
Q

A material is said to be ______ if its composition and properties are not uniform throughout.

A

heterogeneous

37
Q

The properties of a material that changes when the amount of substance changes are called _______ properties.

A

extensive

38
Q

The properties of a material that do not change when the amount of substance changes are called _______ properties.

A

intensive

39
Q

Which of the following is NOT an intensive property of a material?

A

Surface area

40
Q

Which of the following is NOT an extensive property of a material?

A

Density

41
Q

When two or more elements form more than one compound, the ratio of the masses of one element that combine with a given mass of another element in the different compounds is the ratio of small whole numbers.” This statement is known as:

A

Law of multiple proportion

42
Q

“The masses of elements in a pure compound are always in the same proportion.” This statement is known as ________.

A

Law of definite proportion

43
Q

Who formulated the atomic theory?

A

John Dalton

44
Q

Who revised the atomic theory by replacing the hard, indestructible spheres imagined by Dalton and proposed the “raisin bread model” of the atom?

A

Joseph John Thomson

45
Q

How does Joseph John Thomson call his model of the atom?

A

Plum-pudding model

46
Q

The discovery of radioactivity further confirms the existence of subatomic particles. Who discovered radioactivity?

A

Henri Becquerel

47
Q

What is the common unit used to indicate the mass of a particle?

A

Atomic mass unit (amu)

48
Q

What is the unit for a charge of a particle?

A

Charge unit

49
Q

What is the charge of an electron in coulomb?

A

-1.60217733 x 10^-19

50
Q

What is the charge of an electron in charge unit?

A

1 –

51
Q

It is a concept in which excess electric charge is treated as a continuum of charge distributed over a region of space (either a volume or an area) rather than distinct point-like charges.

A

space charge

52
Q

flux lines/magnetic field lines travles:

A

from north to south

53
Q

magnetic fields are created by

A

moving electrical charges

54
Q

what is the value of the permeability of free space or absolute permeability (uo)

A

4pi x10^-7

55
Q

how will you input the absolute permeability on a calculator

A

shift+const+33

56
Q

the total number of magnetic lines of force leaving or entering the pole of magnet

A

magnetic flux

57
Q

If you increase the current through a wire the strength of the magnetic field

A

increases

Electricity and Magnetism (2 decks)

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