Electricity and Magnetism

Question 1

Process by which and atom loses or gains electrons

Answer 1

ionization

Question 2

electron that has its valence shell removed due to the application of ionization energy

Answer 2

free electron

Question 3

Conductors have ____ eV energy gap.

Answer 3

0

Question 4

Semiconductors have around ___ eV energy gap.

Answer 4

1

Question 5

Insulators have around __ 5 eV energy gap.

Answer 5

5

Question 6

Silicon energy gap is ___ eV.

Answer 6

1.1

Question 7

Germanium has an energy gap of __ eV.

Answer 7

0.67

Question 8

Region that separates the valence and conduction bands

Answer 8

forbidden band/energy gap

Question 9

refers to set of physical phenomena associated with the presence of electric charge

Answer 9

Electricity

Question 11

electron flow is from _____ to ______

Answer 11

negative to positive

Question 12

electric field lines/hole flow/conventional flow is from ____ to _____

Answer 12

positive to negative

Question 13

Phenomena where charged body at rest exhibits electric field, which interact with other bodies.

Answer 13

Electrostatics

Question 14

Unlike charges attract. Like charges repel.

Answer 14

First Law of Electrostatics

Question 15

Second Law of Electrostatics is also called

Answer 15

Coulomb’s Law

Question 16

Force between two charges is directly proportional to the magnitude of the charges and inversely proportional to the square of distance

Answer 16

Coulomb’s Law

Question 17

Force per unit positive charge that would be experience by a stationary point charge in a given location in a field. It is also the space between and around the charged bodies where their influence is felt.

Answer 17

Electric Field

Question 18

electrification in which certain materials become electrically charged after they come into contact with another different material through friction

Answer 18

turboelectric effect

Question 19

minimum amount of current to kill a person

Answer 19

0.1 A or 100 mA

Question 20

study of phenomena associated with charged bodies in motion and varying electric fields

Answer 20

electrodynamics

Question 21

drift due to ionization of electrons which has an unpredictable path flows in a haphazard manner

Answer 21

random drift

Question 22

drift/direction of migration of mobile (free) electrons due to the potential difference

Answer 22

directed drift

Question 23

property of a material to oppose or limit the flow of current or charge

Answer 23

Resistance

Question 24

reciprocal of resistance

Answer 24

conductance

Question 25

ability of a system to store electric charge in the form of electrostatic field. It also opposes the change in voltage

Answer 25

Capacitance

Question 26

store energy in the form of magnetic field. It also opposes the change in current.

Answer 26

Inductance

Question 27

indicates the degree of flux linkage between two inductors

Answer 27

coefficient of coupling (k)

Question 28

property shared by neighboring conductors or inductive devices that enables induction to occur

Answer 28

Mutual Inductance

Question 29

phenomenon whereby substance attracts pieces of iron

Answer 29

Magnetism

Question 30

Outside magnet flow is from:

Answer 30

north to south

Question 31

Inside magnet flow is from:

Answer 31

south to north

Question 32

magnetic potential, analogous to voltage

Answer 32

magnetomotive force (mmf)

Question 33

Measure of the strength of a magnetic field at a given point.

Answer 33

Magnetic Field Intensity/Magnetizing Force/Magnetic Field Strength

Question 34

Total number of magnetic lines of force leaving or entering the pole of magnet, analogous to current

Answer 34

Magnetic Flux

Question 35

number of magnetic field lines per unit of a section perpendicular to the direction of flux

Answer 35

Flux Density (B)

Question 36

The lagging effect between the flux density of a material and the magnetizing force producing it.

Answer 36

Hysteresis

Question 37

Ability of a ferromagnetic material to withstand an external magnetic field without becoming demagnetized

Answer 37

Coercivity

Question 38

value of magnetization of a magnetic substance that remain within it even after removal of the applied magnetic field

Answer 38

Retentivity

Question 39

This refers to the ability of a material to allow magnetic flux to flow through it

Answer 39

permeability

Question 40

opposition to magnetic flux; analogous to resistance

Answer 40

Reluctance

Question 41

Reciprocal of reluctance

Answer 41

permeance

Question 42

metals that have a relative permeability much greater than 1

Answer 42

Ferromagnetic

Question 43

Materials that have a relative permeability slightly greater than 1

Answer 43

Paramagnetic

Question 44

Mataerials that have a relative permeability slightly less than 1

Answer 44

Diamagnetic

Question 45

Non-metals that exhibit magnetic properties

Answer 45

ferrimagnetic

Question 46

Magnetic field that can be set-up by moving charges

Answer 46

electromagnetism

Question 47

Happens when a conductor is moved across a magnetic field so as to cut through the lines of force (or flux), an electromotive force (emf) is produced in the conductor

Answer 47

Electromagnetic Induction

Question 48

Whenever the magnetic flux linked with a closed circuit changes, an electromotive force is induced in the circuit

Answer 48

Faraday’s First Law

Question 49

The magnitude of the induced e.m.of any circuit is proportional to the rate of change of the magnetic flux linking the circuit.

Answer 49

Faraday’s Second Law

Question 50

The direction of an induced emf is always such that it tends to set up a current opposing the motion or the change of flux of responsible for inducing that emf.

Answer 50

Lenz’ Law