AnswersKCPS Physics First 2027Electricity and Magnetism

Electricity and Magnetism — Test Answers

25 verified answers
1
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Which correctly describes the number of one type of component in this circuit?

A
three resistors
B
two batteries
C
three bulbs
D
two switches
2
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Which shows the pieces after the magnet is cut?

A
Image with description A bar magnet is shown broken into two pieces with jagged edges. The left piece has an N pole on its left and an S pole on its right. The right piece has an S pole on its left and an N pole on its right.
B
Image with description A bar magnet is shown broken into two pieces with jagged edges. The left piece has an N pole on its left and an S pole on its right. The right piece has an N pole on its left and an S pole on its right.
C
Image with description A bar magnet is shown broken into two pieces with jagged edges. The left piece contains the letter S, and the right piece contains the letter N.
D
Image with description 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.
3

Which statement should she place in the region marked X?

A
Electrons move between objects.
B
The objects do not touch.
C
The objects have the same charge.
D
The objects develop opposite charges.
4

What is the tendency of a material to oppose the flow of charge?

A
voltage
B
resistance
C
current
D
potential difference
5

Which statement correctly describes Earth’s magnetic field?

A
The magnetic pole near the South Pole is a north pole.
B
A compass can lead a hiker to the geographic North Pole.
C
Field lines circle Earth from east to west.
D
Compasses point toward a magnetic pole that is a north pole.
6

Nina is working with electricity and shortens the wires through which the current is flowing. What is Nina most likely trying to accomplish?

A
convert electric energy to light
B
increase resistance
C
convert electric energy to heat
D
decrease resistance
7

A series circuit contains three 2 Ω resistors and a 6 Ω resistor. The current in each resistor is 4.0 A. What is the voltage of the battery in the circuit?

A
2 point 0 cap v
B
32 cap v
C
3 point 0 cap v
D
48 cap v
8

An object that is made of which material is likely to be attracted to a magnet?

A
plastic
B
nickel
C
nitrogen
D
paper
9

How does increasing the distance between charged objects affect the electric force between them?

A
The electric force decreases because the distance has an indirect relationship to the force.
B
The electric force decreases because the distance has a direct relationship to the force.
C
The electric force increases because the distance has an indirect relationship to the force.
D
The electric force increases because the distance has a direct relationship to the force.
10

Potential difference is measured in which units?

A
watts
B
currents
C
amps
D
volts
11

What is required for an electric charge to flow through a wire?

A
a difference in electric potential
B
high resistance in the wire
C
zero resistance in the wire
D
a balance of electric potential
12

For a constant resistance, how is the voltage related to the current?

A
Voltage is directly proportional to current, so when the voltage doubles, the current doubles.
B
Voltage is directly proportional to current, so when the voltage doubles, the current is cut in half.
C
Voltage is inversely proportional to current, so when the voltage doubles, the current doubles.
D
Voltage is inversely proportional to current, so when the voltage doubles, the current is cut in half.
13

What is the continuous flow of electric charge?

A
voltage
B
current
C
resistance
D
potential difference
14

Cora, an electrician, wraps a copper wire with a thick plastic coating. What is she most likely trying to do?

A
keep the electric potential of the wire balanced
B
increase the voltage produced by the wire
C
keep a current from passing out of the wire
D
decrease the wire’s resistance
15

Which will a positively charged object attract?

A
an object that has a smaller positive charge
B
an object that has a larger positive charge
C
an object that has a negative charge
D
an object that has no charge
16

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 away from the second south pole.
D
The field lines bend toward the second south pole.
17

What is a path through which electric charges travel?

A
voltage
B
electric circuit
C
electric current
D
resistance
18

What happens to an iron bar when it is placed within the coils of a solenoid?

A
It induces a current.
B
It becomes a magnet.
C
It loses its magnetism.
D
It stops the current.
19

Georgia moves an unattached piece of wire back and forth over a magnet. Which best explains what will happen?

A
A current will not be induced because the wire moves through a magnetic field.
B
A current will be induced because the wire is not part of a closed circuit.
C
A current will be induced because the wire moves through a magnetic field.
D
A current will not be induced because the wire is not part of a closed circuit.
20

What is the purpose of the component represented by the symbol?

A
to measure voltage
B
to measure current
C
to provide electrical energy
D
to use electrical energy

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