PHY112 Exam 2 MCC Questions &
Answers (Grade A+)
In a vacuum, electromagnetic radiation of short wavelengths ____
A) can travel both faster and slower than radiation of long
wavelengths.
B) travels faster than radiation of long wavelengths.
C) travels slower than radiation of long wavelengths.
D) travels as fast as radiation of long wavelengths. -
correct answer ✅travels as fast as radiation of long wavelengths
A circular loop of wire has its radius reduced to half in time Δt. A
uniform magnetic field is at an angle of 60o to the plane of the coil,
and the magnetic field doubles its intensity in the same time
interval Δt. During this interval, what happens to the flux through
the coil?
A) It increases
B) It decreases
C) It remains the same
D) Not enough information to tell -
correct answer ✅Decreases.
Which of the following actions will NOT induce a current in a loop
of wire placed horizontally in a vertical magnetic field?
,PHY112 Exam 2 MCC Questions &
Answers (Grade A+)
A) Changing the area of the loop.
B) Increasing the magnetic field.
C) Moving the loop perpendicular to the magnetic field.
D) Spinning the loop of wire around a horizontal axis. -
correct answer ✅Moving the loop perpendicular to the magnetic
field.
Which describes magnetic declination?
A) The angle between Earth's magnetic field and Earth's surface
B) Earth's magnetic field strength at the equator
C) The tendency for Earth's field to reverse itself
D) The angle between directions to true north and magnetic south -
correct answer ✅The angle between directions to true north and
magnetic south
6. The current in a long wire creates a magnetic field in the region
around the wire. How is the strength of that field at a given
distance, r, from the wire's center related to r?
A) The field is directly proportional to r
B) The field is inversely proportional to r
C) The field is directly proportional to r2
, PHY112 Exam 2 MCC Questions &
Answers (Grade A+)
D) The field is inversely proportional to r2 -
correct answer ✅B) The field is inversely proportional to r
7. A current in a long, straight wire produces a magnetic field.
These magnetic field lines ___
A) go out from the wire to infinity.
B) come in from infinity to the wire.
C) form circles that pass through the wire.
D) form circles that go around the wire. -
correct answer ✅D) form circles that go around the wire.
8. An electron that moves with a speed of 3.0 × 104 m/s
perpendicular to a uniform magnetic field of 0.40 T experiences a
force of what magnitude? (e = -1.60 × 10-19 C)
A) 4.8 × 10-14 N
B) 1.9 × 10-15 N
C) 2.2 × 1024 N
D) 0 -
correct answer ✅B) 1.9 × 10-15 N
Answers (Grade A+)
In a vacuum, electromagnetic radiation of short wavelengths ____
A) can travel both faster and slower than radiation of long
wavelengths.
B) travels faster than radiation of long wavelengths.
C) travels slower than radiation of long wavelengths.
D) travels as fast as radiation of long wavelengths. -
correct answer ✅travels as fast as radiation of long wavelengths
A circular loop of wire has its radius reduced to half in time Δt. A
uniform magnetic field is at an angle of 60o to the plane of the coil,
and the magnetic field doubles its intensity in the same time
interval Δt. During this interval, what happens to the flux through
the coil?
A) It increases
B) It decreases
C) It remains the same
D) Not enough information to tell -
correct answer ✅Decreases.
Which of the following actions will NOT induce a current in a loop
of wire placed horizontally in a vertical magnetic field?
,PHY112 Exam 2 MCC Questions &
Answers (Grade A+)
A) Changing the area of the loop.
B) Increasing the magnetic field.
C) Moving the loop perpendicular to the magnetic field.
D) Spinning the loop of wire around a horizontal axis. -
correct answer ✅Moving the loop perpendicular to the magnetic
field.
Which describes magnetic declination?
A) The angle between Earth's magnetic field and Earth's surface
B) Earth's magnetic field strength at the equator
C) The tendency for Earth's field to reverse itself
D) The angle between directions to true north and magnetic south -
correct answer ✅The angle between directions to true north and
magnetic south
6. The current in a long wire creates a magnetic field in the region
around the wire. How is the strength of that field at a given
distance, r, from the wire's center related to r?
A) The field is directly proportional to r
B) The field is inversely proportional to r
C) The field is directly proportional to r2
, PHY112 Exam 2 MCC Questions &
Answers (Grade A+)
D) The field is inversely proportional to r2 -
correct answer ✅B) The field is inversely proportional to r
7. A current in a long, straight wire produces a magnetic field.
These magnetic field lines ___
A) go out from the wire to infinity.
B) come in from infinity to the wire.
C) form circles that pass through the wire.
D) form circles that go around the wire. -
correct answer ✅D) form circles that go around the wire.
8. An electron that moves with a speed of 3.0 × 104 m/s
perpendicular to a uniform magnetic field of 0.40 T experiences a
force of what magnitude? (e = -1.60 × 10-19 C)
A) 4.8 × 10-14 N
B) 1.9 × 10-15 N
C) 2.2 × 1024 N
D) 0 -
correct answer ✅B) 1.9 × 10-15 N
