E&M: Fundamentals Flashcards
What is the diameter of an atom?
10^-10 m
The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages. This is known as
Faraday’s second law of electromagnetic induction
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
Coulomb’s second law
The net electrical charge in an isolated system remains constant. This is known as
Law of conservation of charge
The point in a magnet where the intensity of magnetic lines of force is maximum
Magnetic pole
The emf induced in a coil due to the change of its own flux linked with it is called
Self induced emf
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
Helix rule
The phenomenon by which a substance attracts pieces of iron
Magnetism
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.
Child’s law
Who developed the electromagnetic theory of light in 1862?
James Clerk Maxwell
The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole is called
Magnetic field
States that the ratio of the thermal conductivity is proportional to the absolute temperature for all metals.
Wiedemann Franz law
Materials whose permeabilities are slightly greater than that of free space
Paramagnetic
Who discovered the relationship between magnetism and electricity that serves as the foundation for the theory of electromagnetism?
Hans Christian Oersted
Materials that have very high permeabilities (hundreds and even thousands times of that of free space)
Ferromagnetic
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
End Rule
The straight line passing through the two poles of magnet is called
Magnetic axis
Who discovered the most important electrical effects which is the magnetic effect?
Hans Christian Oersted
Define as that pole which when placed in air from a similar and equal pole repels it with a force of newtons
Unit pole
Referred to as the specific reluctance of a material
Reluctivity
Which of the following magnetic materials can be easily magnetized in both direction?
Soft magnetic materials
The force which set ups or tends to set up magnetic flux in a magnetic circuit
Magnetomotive force
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.
Ampere’s circuital law
The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet
Magnetic induction
The magnetic potential in a magnetic circuit can be measured in terms of
Mmf
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
Feel slippery on the skin
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
Dissolve metals producing various salts and hydrogen gas
An acid can react with base to produce a __________.
salt
Vinegar is a solution of water and what kind of acid?
Acetic acid
What acid is added to carbonated drinks to produce a tart test?
Phosphoric acid
Table salt or sodium chloride may be formed by the reaction of:
Hydrochloric acid and sodium hydroxide
What occurs when a substance is transformed into another substance with a totally different composition and properties?
Chemical change
What occurs when a substance changes it appearance without changing its composition?
Physical change
What is another term for “chemical change”?
Chemical reaction
A material is said to be ______ if its composition and properties are uniform throughout.
homogeneous
A material is said to be ______ if its composition and properties are not uniform throughout.
heterogeneous
The properties of a material that changes when the amount of substance changes are called _______ properties.
extensive
The properties of a material that do not change when the amount of substance changes are called _______ properties.
intensive
Which of the following is NOT an intensive property of a material?
Surface area
Which of the following is NOT an extensive property of a material?
Density
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:
Law of multiple proportion
“The masses of elements in a pure compound are always in the same proportion.” This statement is known as ________.
Law of definite proportion
Who formulated the atomic theory?
John Dalton
Who revised the atomic theory by replacing the hard, indestructible spheres imagined by Dalton and proposed the “raisin bread model” of the atom?
Joseph John Thomson
How does Joseph John Thomson call his model of the atom?
Plum-pudding model
The discovery of radioactivity further confirms the existence of subatomic particles. Who discovered radioactivity?
Henri Becquerel
What is the common unit used to indicate the mass of a particle?
Atomic mass unit (amu)
What is the unit for a charge of a particle?
Charge unit
What is the charge of an electron in coulomb?
-1.60217733 x 10^-19
What is the charge of an electron in charge unit?
1 –
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.
space charge
flux lines/magnetic field lines travles:
from north to south
magnetic fields are created by
moving electrical charges
what is the value of the permeability of free space or absolute permeability (uo)
4pi x10^-7
how will you input the absolute permeability on a calculator
shift+const+33
the total number of magnetic lines of force leaving or entering the pole of magnet
magnetic flux
If you increase the current through a wire the strength of the magnetic field
increases
