Lab: Magnetic and Electric Fields — Unit test Answers
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Which would ultimately cause the armature in an electric motor to spin?
A
The current in the armature stops.B
The gap in the commutator closes.C
The current in the armature is reversed.D
The commutator loses contact with the brushes.22
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How are the current and resistance related when the voltage of a circuit is constant?
A
The current doubles when the resistance doubles because they are directly proportional.B
The current doubles when the resistance doubles because they are inversely proportional.C
The current is cut in half when the resistance doubles because they are directly proportional.D
The current is cut in half when the resistance doubles because they are inversely proportional.23
A bar magnet is cut in half, as shown. Which shows the pieces after the magnet is cut?
A
2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N S from left and on the right a piece labeled N S from left.B
2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N S from left and on the right a piece labeled S N from left.C
2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N and on the right a piece labeled S.D
2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled S and on the right a piece labeled N.24
Mateo makes a table of the symbols that represent the parts of an electric circuit.
A
Uses electrical energyB
Provides electrical energyC
Measures electric currentD
Controls electric current25
How are the magnetic field lines near the south pole of a magnet affected when a second south pole is brought near it?
A
The field lines combine with the lines around the second south pole.B
The field lines overlap with the lines from the second south pole.C
The field lines bend toward the second south pole.D
The field lines bend away from the second south pole.Did you find these answers helpful?
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