Part 2 Chapter 1 -Electricity and Magnetism

Question 1

It is when attraction takes place

Answer 1

Magnetism

Question 2

Magnetic Quantities

Answer 2

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

Question 3

Counterpart of Current in Electricity

Answer 3

Magnetic Flux

Question 4

Counterpart of Voltage in Electricity

Answer 4

Magnetomotive Force

Question 5

Counterpart of Resistance in Electricity

Answer 5

Reluctance

Question 6

Counterpart of Conductance in Electricity and also a reciprocal of Reluctance

Answer 6

Permeance

Question 7

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

Answer 7

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

Question 8

What is the Formula of Magnetic Flux Density

Answer 8

B = Magnetic Flux / Area

Question 9

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

Answer 9

Hans Christian Oersted

Question 10

Demonstrated the theory of electromagnetic induction in 1831

Answer 10

Michael Faraday

Question 11

Developed the electromagnetic theory of light in 1862

Answer 11

James clerk maxwell

Question 12

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

Answer 12

Michael Faraday

Question 13

Discovered the most important electrical effects which is magnetic effect

Answer 13

Hans Christian Oersted

Question 14

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

Answer 14

Andre Ampere

Question 15

Discovered superconductivity in 1911

Answer 15

Kamerlingh Onnes

Question 16

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

Answer 16

Faraday Second Law of Electromagnetic Induction

Question 17

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

Answer 17

Faraday First Law of Electromagnetic Induction

Question 18

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

Answer 18

Coulombs First Law

Question 19

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

Answer 19

Coulombs Second Law

Question 20

Whenever a conductor cuts magnetic flux an EMF induced in it

Answer 20

Faraday’s Law

Question 21

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

Answer 21

Lenz Law

Question 22

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

Answer 22

Child’s Law

Question 23

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

Answer 23

Wiedemann-Franz Law

Question 24

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

Answer 24

Ampere’s Circuital Law

Question 25

The "net electric charge" in an "isolated system remains constant "

Answer 25

Law of Conservation of Charge

Question 26

Lenz law is the consequence of the law of conservation of

Answer 26

Energy

Question 27

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

Answer 27

Always oppose the cause producing it

Question 28

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

Answer 28

Right Hand Rule

Question 29

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

Answer 29

Cork Screw Rule

Question 30

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

Answer 30

End Rule

Question 31

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

Answer 31

Helix Rule

Question 32

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

Answer 32

Electromagnetic induction

Question 33

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

Answer 33

Self Induced EMF

Question 34

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

Answer 34

Mutually Induced EMF

Question 35

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

Answer 35

Statically Induced EMF

Question 36

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

Answer 36

Magnetomotive force

Question 37

A substance that attracts pieces of irol

Answer 37

Magnet

Question 38

The phenomenon by which a substance attracts pieces of iron

Answer 38

Magnetism

Question 39

Which of the following is a natural magnet

Answer 39

Lodestone

Question 40

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

Answer 40

Unit Pole (k)

Question 41

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

Answer 41

Magnetic Pole

Question 42

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

Answer 42

Magnetic Axis

Question 43

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

Answer 43

Electromagnetism

Question 44

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

Answer 44

Magnetic Field

Question 45

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

Answer 45

Magnetic Flux

Question 46

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

Answer 46

Magnetic Induction

Question 47

Magnetic materials can be easily magnetized in both direction

Answer 47

Soft Magnetic Materials

Question 48

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

Answer 48

Diamagnetic

Question 49

Materials whose permeabilities are slightly greater than that of free space

Answer 49

Paramagnetic

Question 50

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

Answer 50

Ferromagnetic

Question 51

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

Answer 51

Flux

Question 52

What is the diameter of an atom?

Answer 52

About 10^-10 m

Question 53

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

Answer 53

Magnetic Ciruit

Question 54

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

Answer 54

magnetomotive force