3.2: Static Electricity and Conduction

Question 1

Answer 1

Option B: four electrons in the outer shell

Conductor has 3 or less electrons in outer shell

Semi-conductor has 4 electrons in outer shell

Insulator has 5 - 8 electrons in outer shell

Question 2

Conductor has ___________________

Semi-conductor has_________________

Insulator has _________________

(electrons)

Answer 2

Conductor has 3 or less electrons in outer shell

Semi-conductor has 4 electrons in outer shell

Insulator has 5 - 8 electrons in outer shell

Question 3

Answer 3

Option B: liquids and gasses

Question 4

Answer 4

Option B: solids and liquids only

Question 5

Answer 5

Option B: glass

Question 6

Answer 6

Option B: the use of a conducting type nose wheel

Usually, the nose wheel tyre contains graphite, to dissipate the static electricity on landing

Question 7

Answer 7

Option A: a small number of electrons in its outer orbit

The lower the number of electrons in the outer shell, the more readily it will give them up.

Conductor 3 or less electrons in outer shell

Semi-conductor has 4 electrons in its outer shell

Insulator has 5-8 electrons in its outer shell

Question 8

Answer 8

Option A: a surplus or deficiency of electrons

If it has a surplus of electrons it is negatively charged. A deficiency of electrons makes it positively charged

Question 9

Answer 9

Option A: by connecting all metal components by bonding

Question 10

Answer 10

Option B: stop different potentials developing with subsequent fire risks

Question 11

Answer 11

Option B: bonding

Question 12

Answer 12

Option A: structure is adequately bonded

Question 13

Answer 13

Option C: positively charged

The free electrons in the conductor will be repelled away from the rod, leaving that end positively charged

Question 14

Answer 14

Option B: inversely proportional to the square of the distance between them

Question 15

Answer 15

Option C: the rod becomes positively charged

The negative charge on the rod are repelled by the charged conductor (regardless of installation)

Question 16

30. The force that keeps the electrons orbiting the nucleus of an atom is called the;
    (a) The magnetic force.
    (b) The electrostatic force,
    (c) The gravitational force

Answer 16

(b) The electrostatic force,

The electrostatic force is the force of attraction or repulsion between two charged particles. It is also called Coulomb’s force or Coulomb’s interaction.

Question 17

31. Coulomb’s Law of electrostatic states that:
    (a) Unlike charges attract, like charges repel.
    (b) Unlike charges repel, like charges attract,
    (c) Unlike charges attract, like charges attract.

Answer 17

(a) Unlike charges attract, like charges repel.

Question 18

32. If two negatively charged bodies are brought into close proximity, the force between the two bodies will:
    (a) increase
    (b) decrease
    (c) stay the same

Answer 18

(a) increase

Question 19

33. If you reduce the distance between 2 charged bodies by half, the force of attraction or repulsion will:
    (a) Increase by a factor of 2.
    (b) Increase by a factor of 4.
    (c) Decrease by a factor of 2

Answer 19

(b) Increase by a factor of 4.

Question 20

34. Two charged objects, which are separated by a distance of 10 meters have a repulsive force of 10 Newtons. What is the force between them if the distance is reduced to 5 meters?
    (a) 2.5 N Repulsive
    (b) 20 N Repulsive
    (c) 40 N Repulsive

Answer 20

(c) 40 N Repulsive

Question 21

35. Which of following actions describes the easiest way to accumulate a static electric charge?
    (a) Friction between two conductors
    (b) Friction between two insulators
    (c) Pressure between two conductors
    (d) Pressure between two insulators

Answer 21

(b) Friction between two insulators

The three ways of placing static charge are through:

Friction

Contact - physically touching off a charged object

Induction - ‘‘Luring’’ charge to one side of an object and then removing its balancing charged particles (boat whale example in class)

Question 22

If two positively charged bodies are moved further away from each other, the force between the two bodies will:

(a) increase
(b) decrease
(c) stay the same

Answer 22

(b) decrease

Question 23

37. How do “like” and “unlike” charges react to one another?
    (a) Unlike charges repel each other, like charges repel each other
    (b) Unlike charges attract each other, like charges attract each other
    (c) Unlike charges repel each other, like charges attract each other
    (d) Unlike charges attract each other, like charges repel each other

Answer 23

(d) Unlike charges attract each other, like charges repel each other

Question 24

38. Creating a charge by electrostatic induction would occur if:
    (a) Uncharged bodies are brought into close proximity.
    (b) Two charged items are brought into contact
    (c) A charged item is brought into close proximity to an uncharged item.

Answer 24

(c) A charged item is brought into close proximity to an uncharged item.

'’Induction charging is a method used to charge an object without actually touching the object to any other charged object.’’

Question 25

39. Electrostatic lines of force are drawn in which of the following manners?
    (a) Entering negative charge, entering positive charge
    (b) Entering negative charge, leaving positive charge
    (c) Leaving negative charge, leaving positive charge
    (d) Leaving negative charge, entering positive charge

Answer 25

(b) Entering negative charge, leaving positive charge

'’Flow is from positive to negative’’

Question 26

40. Electrostatic charge distribution on charged metallic plates would be greatest at the:
    (a) extremities
    (b) broadest section
    (c) Narrowest section.

Answer 26

(a) extremities

'’That is, it will discharge the static electricity from the extremities of the aircraft, such as the wing tips, horizontal stabilizer, vertical stabilizer, antenna, propeller tips etc

Question 27

41. You can create a static charge on a body by:
    (a) Friction, heat, pressure.
    (b) Induction, expansion, touching.
    (c) Friction, touching, induction.

Answer 27

(c) Friction, touching, induction.

The three ways of placing static charge are through:

Friction

Contact - Physically touching off a charged particle

Induction - ‘‘luring’’ charge to one side of an object and then removing its balancing charged particles

Question 28

42. On a sphere, the static charge is
    (a) Concentrated around the diameter of the sphere.
    (b) Concentrated around the poles of the sphere.
    (c) Concentrated uniformly around the surface of the sphere.

Answer 28

(c) Concentrated uniformly around the surface of the sphere.

Question 29

43. The amount of static electricity generated on an aircraft would be greatest:
    (a) on cold wet days
    (b) on warm dry days
    (c) at night time

Answer 29

(b) on warm dry days

Question 30

44. On a flat, square object the static charges are concentrate;
    (a) Along the diagonal of the square.
    (b) At the corners of the square,
    (c) Along one sharp edge of the square.

Answer 30

(b) At the corners of the square,

Question 31

45. Copper is a good conductor because:
    (a) Of the large number of free protons available.
    (b) Of the small number of free electrons available,
    (c) Of the large number of covalent bonds.

Answer 31

(b) Of the small number of free electrons available,

Question 32

46. The presence of ions in a liquid make it;
    (a) Freeze quickly,
    (b) A good insulator,
    (c) A good conductor

Answer 32

(c) A good conductor

'’The more ions that are present, the higher the conductivity of water. Likewise, the fewer ions that are in the water, the less conductive it is’’

Question 33

47. An element could be considered to be a conductor if it has
    (a) a large number of electrons
    (b) a large number of electrons in its outer orbit
    (c) a small number of electrons in its outer orbit

Answer 33

(c) a small number of electrons in its outer orbit

'’The lower the number of electrons in the outer shell, the more readily it will give them up’’

Conductor has 3 or less electrons in its outer shell

Semi-conductor has 4 electrons in its outer shell

Insulator has 5-8 electrons in its outer shell

Question 34

48. An electric current is a flow of
    (a) electrons from a positively charged area to a negatively charged area
    (b) protons from a positively charged area to a negatively charged area
    (c) electrons from a negatively charged area to a positively charged area

Answer 34

(c) electrons from a negatively charged area to a positively charged area

'’Electrons flow from negative to positive’’

Question 35

Which of the following actions describes the easiest way to accumulate a static electric charge?

(a) Friction between two conductors
(b) Friction between two insulators

(.c) Pressure between two conductors

Answer 35

(b) Friction between two insulators

Question 36

You can create a static charge on a body by:

(a) Friction, heat, pressure
(b) Induction, expansion, touching

(.c) Friction, touching, induction

Answer 36

(.c) Friction, touching, induction

Question 37

Answer 37

(.c) A charged item is brought into close proximity to an uncharged item

Question 38

Answer 38

(.c) Concentrated uniformly around the surface of the sphere

Question 39

Answer 39

(a) unlike charges attract, like charges repel

Question 40

Answer 40

(b) Entering negative charge, leaving positive charge

Question 41

Answer 41

(b) decrease

Question 42

Answer 42

© Decrease by a factor of 4

Question 43

Answer 43

© 40 N Repulsive

Question 44

Answer 44

(b) on warm dry days

Question 45

Answer 45

the stripping of electrons from one body and depositing them on another

Question 46

Answer 46

Siemens

Question 47

Answer 47

5 amps

Note: 1 Coulomb = 1 amp / 1 second

10 Coulombs = 10 amps / 2 seconds → 5 amps

Question 48

1. If you reduce the distance between 2 charged bodies by 1/3 , the force of attraction or repulsion will:
   (a) Increase by a factor of 3.
   (b) Increase by a factor of 9.
   (c) Decrease by a factor of 3

Answer 48

(b) Increase by a factor of 9.