AnswersTX-Physics CRLab: Circuit Design

Lab: Circuit Design — Unit test Answers

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This diagram shows the magnetic field lines near the ends of two magnets. There is an error in the diagram.

Question illustration
A
changing the N to S
B
reversing the arrows on the left to point toward the N
C
changing the S to N
D
reversing the arrows on the right to point toward the S
2
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The north pole of a strong magnet is dragged down an iron nail from the top to the point 50 times.

A
The nail will not pick up any paper clips because its domains are not aligned.
B
The nail will not pick up any paper clips because its domains have been aligned.
C
The nail will pick up some paper clips because its domains are not aligned.
D
The nail will pick up some paper clips because its domains have been aligned.
3

The diagram shows a positive charge moving in a magnetic field.

Question illustration
A
into the screen
B
out of the screen
C
up
D
down
4

What must be known to determine the direction of the magnetic force on a charge? Check all that apply.

A
the type of the charge
B
the amount of the charge
C
the direction of the magnetic field
D
the velocity of the charge
E
the strength of the magnetic field
5

Joan makes the device shown in her science class.

Question illustration
A
The field would stop.
B
The field would get stronger.
C
The field would reverse its poles.
D
The field would get weaker.
6

The diagram shows two bar magnets. They are cut along the dashed line, and then the two marked ends are placed near each other.

Question illustration
A
The pieces will repel because the cut end of the top magnet is not a magnetic pole.
B
The pieces will attract because the cut end of the top magnet is not a magnetic pole.
C
The pieces will repel because the cut end of the top magnet is a south pole.
D
The pieces will attract because the cut end of the top magnet is a north pole.
7

The voltage across the primary winding is 6000 V. If the primary winding has 50 coils and the secondary winding has 20 coils, what is the secondary voltage?

A
120 V
B
2400 V
C
15,000 V
D
120,000 V
8

Which equation is used to calculate the magnetic force on a charge moving in a magnetic field?

A
F = |q|vBcos
Option A
B
F = |q|vBsin
Option B
C
F = |q|Bcos
Option C
D
F = |q|Bsin
Option D
9

Four compasses are placed around a wire, as shown.The wire is then connected to a battery so that a current flows down the wire.How will the compasses point once the current is flowing?

Question illustration
A
A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing in the same direction, west.
Option A
B
A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing in the same direction, east.
Option B
C
A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing clockwise.
Option C
D
A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing counterclockwise.
Option D
10

[BLANK]

A
fingers
B
palm
C
back
D
thumb
11

The voltage across the secondary winding is 10,000 V, and the voltage across the primary winding is 25,000 V. If the primary winding has 200 coils, how many coils are in the secondary winding?

A
50 coils
B
80 coils
C
125 coils
D
500 coils
12

What direction can the charge move and experience no magnetic force? Check all that apply.

A
up
B
down
C
left
D
right
E
into the screen
F
out of the screen
13

When the north pole of a bar magnet is moved into a solenoid, the needle on a galvanometer attached to the solenoid moves to the left, indicating that a current is produced. The magnet is then pulled out at a faster speed.What will be the result?

A
a larger current in the same direction
B
a larger current in the opposite direction
C
a smaller current in the same direction
D
a smaller current in the opposite direction
15

Which will produce a magnetic field?

A
any wire with or without a current
B
a wire formed into a coil
C
a wire carrying a current
D
a wire formed into a single loop
16

Tonya is modeling the discovery of electromagnetic induction. Which procedure should she use?

A
moving a magnet into a coil of wire in a closed circuit
B
moving a magnet into a coil of wire in an open circuit
C
bringing a compass near a wire that has no electric current
D
bringing a compass near a wire that has an electric current
17

A point charge of 5.0 × 10–7 C moves to the right at 2.6 × 105 m/s in a magnetic field that is directed into the screen and has a field strength of 1.8 × 10–2 T.

A
0 N
B
2.3 × 10–3 N
C
23 N
D
2.3 × 1011 N
18

The voltage across the primary winding is 350,000 V, and the voltage across the secondary winding is 17,500 V. If the secondary winding has 600 coils, how many coils are in the primary winding?

A
30 coils
B
583 coils
C
12,000 coils
D
332,500 coils
19

Steel objects can become temporary magnets because they are mainly composed of which element?

A
carbon
B
iron
C
nickel
D
cobalt
21

When using the right-hand rule to determine the direction of the magnetic field around a current-carrying straight wire, which part of the right hand points in the direction of the magnetic field?

A
palm
B
fingers
C
back
D
thumb
22

The diagram shows a negative charge moving in a magnetic field.

Question illustration
A
right
B
left
C
into the screen
D
out of the screen

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