DMI105 - Module 5 – Electromagnetism
UPDATED ACTUAL Exam Questions and
CORRECT Answers
Define Electromagnetism. - CORRECT ANSWER - The movement of electron in an
electrical current which creates a magnetic field. (2.1)
Define magnetism. - CORRECT ANSWER - The ability of certain materials to attract iron,
cobalt or nickel. (2.3)
What element is most commonly used in magnets? - CORRECT ANSWER - Iron. (2.3)
What is a dipole? - CORRECT ANSWER - A tiny magnetic field created by a single
spinning electron. This is characteristic of a single atom of an element. (2.3)
When many dipoles align with each other they create an organized group called a
_____________? - CORRECT ANSWER - Magnetic domain. (2.3)
True or False: Magnetic materials contain only a single magnetic domain along its axis. -
CORRECT ANSWER - False; Many magnetic domains may exist in magnetic material.
(2.3)
A collective of magnetic domains aligned in a single direction is called a _______. - CORRECT
ANSWER - Magnet. (2.3)
Define Magnetic Field. - CORRECT ANSWER - The area around moving charged
particles. (2.4)
A magnetic field consists of lines of force in space called ______. - CORRECT
ANSWER - Flux. (2.4)
, What are the 3 general characteristics of a magnetic field? - CORRECT ANSWER - 1.
DIRECTIONALITY: INSIDE the magnet, lines of force travel from the SOUTH pole TO the
NORTH pole, while on the OUTSIDE, the lines of force travel from NORTH pole TO the
SOUTH pole.
2. ATTRACTION: Lines of force in the SAME DIRECTION REPEL each other while lines of
force moving in OPPOSITE DIRECTION ATTRACT each other.
3. MATERIALS: Magnetic fields are distorted by magnetic materials and unaffected by non-
magnetic materials. (2.4)
True or False: Protons or electrons can induce a magnetic field. - CORRECT ANSWER -
True; Any spinning electrical charge will induce a magnetic field. (2.4)
If every electric charge creates a magnetic field why is it that everything is not magnetic? -
CORRECT ANSWER - Because most atoms have equal numbers of opposing magnetic
fields and cancel each other out. (2.4)
What are the 3 laws of magnetism? - CORRECT ANSWER - 1. Every magnet, even if it is
only a single particle, has a North and South Pole.
2. Like poles repel each other and opposite poles attract each other.
3. The force of attraction or repulsion is directly related to the strength of the poles and inversely
related to the square of the distance between them. (2.5)
What is the SI unit used to measure the strength of the magnetic field? - CORRECT
ANSWER - The Tesla. (2.5)
What is the average magnetic field strength of the earth? - CORRECT ANSWER -5x
10^-5 T. (2.5)
UPDATED ACTUAL Exam Questions and
CORRECT Answers
Define Electromagnetism. - CORRECT ANSWER - The movement of electron in an
electrical current which creates a magnetic field. (2.1)
Define magnetism. - CORRECT ANSWER - The ability of certain materials to attract iron,
cobalt or nickel. (2.3)
What element is most commonly used in magnets? - CORRECT ANSWER - Iron. (2.3)
What is a dipole? - CORRECT ANSWER - A tiny magnetic field created by a single
spinning electron. This is characteristic of a single atom of an element. (2.3)
When many dipoles align with each other they create an organized group called a
_____________? - CORRECT ANSWER - Magnetic domain. (2.3)
True or False: Magnetic materials contain only a single magnetic domain along its axis. -
CORRECT ANSWER - False; Many magnetic domains may exist in magnetic material.
(2.3)
A collective of magnetic domains aligned in a single direction is called a _______. - CORRECT
ANSWER - Magnet. (2.3)
Define Magnetic Field. - CORRECT ANSWER - The area around moving charged
particles. (2.4)
A magnetic field consists of lines of force in space called ______. - CORRECT
ANSWER - Flux. (2.4)
, What are the 3 general characteristics of a magnetic field? - CORRECT ANSWER - 1.
DIRECTIONALITY: INSIDE the magnet, lines of force travel from the SOUTH pole TO the
NORTH pole, while on the OUTSIDE, the lines of force travel from NORTH pole TO the
SOUTH pole.
2. ATTRACTION: Lines of force in the SAME DIRECTION REPEL each other while lines of
force moving in OPPOSITE DIRECTION ATTRACT each other.
3. MATERIALS: Magnetic fields are distorted by magnetic materials and unaffected by non-
magnetic materials. (2.4)
True or False: Protons or electrons can induce a magnetic field. - CORRECT ANSWER -
True; Any spinning electrical charge will induce a magnetic field. (2.4)
If every electric charge creates a magnetic field why is it that everything is not magnetic? -
CORRECT ANSWER - Because most atoms have equal numbers of opposing magnetic
fields and cancel each other out. (2.4)
What are the 3 laws of magnetism? - CORRECT ANSWER - 1. Every magnet, even if it is
only a single particle, has a North and South Pole.
2. Like poles repel each other and opposite poles attract each other.
3. The force of attraction or repulsion is directly related to the strength of the poles and inversely
related to the square of the distance between them. (2.5)
What is the SI unit used to measure the strength of the magnetic field? - CORRECT
ANSWER - The Tesla. (2.5)
What is the average magnetic field strength of the earth? - CORRECT ANSWER -5x
10^-5 T. (2.5)
