Download Electromagnetism Quiz Review with Answers

Electromagnetism Quiz Review
Mr. Davis Baltimore Poly
1) Electricity can be generated by rotating a wire loop
between the poles of a magnet. In which of the following
positions would induce the greatest current in the loop?

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A. The plane of the loop is parallel to the magnetic field.
B. The plane of the loop is perpendicular to the magnetic
field.
C. The plane of the loop makes an angle of 45° with the
magnetic field.
D. The induced current is the same in all positions.
Answer: A
2) In a transformer, the secondary loop has twice as many
turns as the primary. If the alternating current in the
primary loop is 2 A, what is the current in the secondary
loop?
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A. 1 A
B. 2 A
C. 4 A
D. It cannot be determined.
Answer: C
3) The voltage across the input terminals of a transformer is
110 V. The primary has 50 loops and the secondary has
120 loops. The output voltage of the transformer is
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A. 46 V.
B. 55 V.
C. 180 V.
D. 264 V
E. 0 V
Answer: D
4) A steady current, I, flows though a straight wire. A
circular loop of wire is placed next to the wire. Which of
the following will not produce an induced current in the
loop?
 A. Move the loop away from the wire.
 B. Move the loop toward the wire.
 C. Increase the electric current in the wire.
 D. Decrease the electric current in the wire.
 E. Move the loop in parallel to the wire.
Answer: E
5) A bar magnet with the north pole faced downward is held
above a horizontal circular coil. Which of the following
statements about the induced current is true (viewed from
above)?
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A. The induced current flows in a clockwise direction.
B. The induced current flows in a
counter-clockwise direction.
C. The induced current flows first in a clockwise
and then in a counter-clockwise direction.
D. The induced current flows first in a
counter-clockwise and then in a clockwise direction.
E. There is no induced current in the coil.
Answer: E
6) A rectangular loop of wire with dimensions 0.2 m x 0.5
m is placed in a uniform magnetic field of magnitude 2 T.
The magnetic field is perpendicular to the plane of the
loop. What is the magnetic flux in the loop?
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A. 0.1 Tm2
B. 0.2 Tm2
C. 0.3 Tm2
D. 0.4 Tm2
E. 0.5 Tm2
Answer: B
7) The magnetic flux through a wire loop in a magnetic field B does
NOT depend on:
A)
B)
C)
D)
The magnetic of the field
The area of the loop
The shape of the loop
The angle between the loop and the direction of B
Answer: C
8) The emf produced in a wire by its motion across a
magnetic field depends on the orientation of the wire.
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
A) True
B) False
Answer: A
9) The path of a charged particle moving parallel to a
uniform magnetic field will be:
A)
B)
C)
D)
Straight line
Circle
Ellipse
Parabola
Answer: A
10) In a transformer, the primary coil has twice as many
loops as the secondary coil. This is a _____ transformer.
A)
B)
C)
D)
E)
Step-down
Reduction
Induction
Step-up
Voltage
Answer: A
11) In a mass spectrometer, an ion will have a smaller
radius for its circular path if:
A)
B)
C)
D)
Its speed is greater
Its charge is greater
The magnetic field is weaker
Its mass is greater
Answer: D