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ELECS > Electromagnetics > Flashcards

Electromagnetics Flashcards

1
Q

The magnetomotive force per unit length is called the _______

A

Magnetic field Strength or Magnetizing Force

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2
Q

These are passive electronic component which is capable of storing electrical energy in the form of magnetic energy.

A

Inductors

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3
Q

Electric current will produce a magnetic field around the conductor.
Magnetic field does not have specific north or south poles.

A

Electromagnetic Induction

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4
Q

A current generated in a conductor by a changing magnetic field is proportional to the rate of change of the magnetic field.

A

Inductance

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5
Q

What law states that “An induced effect is always such as to oppose the cause that produce it.”

A

Lenz’ law

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6
Q

When coils are closer to each other without shielding, it is possible for the two inductors to couple

A

Mutual Inductance

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7
Q

Types of Electricity

A

Static and Dynamic

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8
Q

It is the movement of electrons from one point to another

A

Electricity

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9
Q

Electricity came from a greek word “_______” which means “Amber”

A

Elektron

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10
Q

As early as 600 B.C. Greeks observed that after rubbing amber with wool, the amber could attract other objects.

This is an “attraction” phenomenon called _______

A

Amber effect

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11
Q

When the number of electrons is equal to the number of protons, the atom is in:

A

Neutral

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12
Q

When the number of electrons is greater than the protons, it is called

A

Anion

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13
Q

When the number of electrons is less than the protons, it is called

A

Cation

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14
Q

It is the Accumulation of electric charges, and it is also known as frictional electricity

A

Static Electricity

Accumulate meaning stored charges are waiting to be released. Hence, called static electricity (Stationary)

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15
Q

It is the flow of electric charges, and it also refers to the so called electric current

A

Dynamic Electricity

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16
Q

“Charge is neither created nor destroyed, it can only be transferred from one system to another”

A

Law of Conservation of Charge

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17
Q

What Coulomb’s law states that “The electrostatic force is directly proportional to the product of the charges”

A

First Law

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18
Q

What Coulomb’s law states that “The electrostatic force is inversely proportional to the square of the distance between the charges”

A

Second Law

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19
Q

A region in which a force would be exerted on other charged particles or objects

A

Electric field (N/C) (V/m)

20
Q

It is a measure of flow of electric field through a given area

A

Electric Flux

21
Q

It impedes the flow of AC charges carriers by temporarily storing the energy as an electric field

A

Capacitors

22
Q

What are the basic configurations of a capacitors?

A

Two conductors carrying equal but opposite charges

23
Q

It is the ability of a component or circuit to collect and store energy in the form of an electric charge

A

Capacitance

24
Q

When it comes to Capacitor applications, a job of a _______ is to filter any noise in the power supply, like voltage ripples

A

Decoupling (Bypass)

25
Q

Because of their specific response time, they are able to block low frequency signals while allowing higher frequencies to pass through.

A

Filtering

26
Q

Although they can store considerably lower energy compared to a same size battery, their lifespan is much better, and they are capable of delivering energy much faster

A

Energy storage of a capacitor

27
Q

It is a property possessed by iron, steel and certain other magnetic material, wherein these materials can produce or conduct magnetic lines of forces

A

Magnetism

28
Q

This makes them interact with electric fields or other magnetic fields

A

Magnetism

29
Q

The lines from the poles of a magnet always start from _______

A

North to south

30
Q

However, unlike electric charges which can be separated, magnetic poles _______ be separated

A

Cannot

When a magnet is broken, each piece is found to have a north and south pole

31
Q

What law states that like poles of magnets repel each other while opposite poles attract each other

A

1st Law of Magnetism

32
Q

What law states that “a magnetic field always tends to arrange itself so that the greatest numbers of line of force are created

A

2nd law of Magnetism

33
Q

It is the number of magnetic lines of flux that pass through a certain point on a surface

A

Magnetic flux density

34
Q

It is the ability of a magnetic material to support magnetic field development. It indicates the ease in which an external magnetic field can create a higher magnetic force of attraction in the material

A

Permeability

35
Q

Not capable of being magnetized

A

Nonmagnetic

Example: Air

36
Q

Materials that are freely magnetized, but the direction is opposite to that of the magnetic field.

A

Diamagnetic

Examples: Bismuth, Antimony, Copper, Zinc, Mercury, Gold, Silver

37
Q

Materials that are weakly attracted to magnets.

A

Paramagnetic

Example: Aluminum, Platinum, Manganese, and Chromium

38
Q

Materials having high susceptibility to magnetization.

A

Ferromagnetic

Examples: Iron, Nickel, Cobalt, and alloy of these metals

39
Q

The amount by which relative permeability differs from unity. Has no unit.

A

Susceptibility

40
Q

The amount by which relative permeability differs from unity. Has no unit.

A

Susceptibility

41
Q

The property of a material to allow magnetic flux to be established in a material

A

Permeance

42
Q

It is magnetism produced by an electric current rather than by a natural magnet.

Discovered by _______ in 1819, through a magnetic needle that is deflected at right angles to a wire carrying an electric current

A

Hans Christian Oersted

43
Q

In 1820, _______ and _______ showed that an electric current can be produced in a circuit either by moving a magnet near the circuit.

A

Michael Faraday and Joesph Henry

44
Q

Years later, theoretical work by _______ showed that a changing electric field creates a magnetic field

A

James Clerk Maxwell

45
Q

It is the external force required to serup magnetic flux lines within a magnetic material

A

Magnetomotive Forcs (mmf)

ELECS (3 decks)

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