AnswersTX-Physics CRLab: Circuit Design

Lab: Circuit Design — Unit test Answers

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Trina makes a diagram to summarize how to use the right-hand rule to determine the direction of the magnetic force on each type of charge.

Question illustration
A
X: Thumb, for velocityY: Fingers, for magnetic fieldZ: Palm of hand, for force
B
X: Back of hand, for forceY: Thumb, for velocityZ: Palm of hand, for force
C
X: Palm of hand, for forceY: Thumb, for velocityZ: Fingers, for magnetic field
D
X: Palm of hand, for forceY: Fingers, for magnetic fieldZ: Back of hand, for force
2
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[BLANK]

A
electromagnetism
B
electromagnetic induction
C
electromagnetic spectrum
D
electromagnetic force
3

Which device converts kinetic energy into electrical energy?

A
an electric generator
B
an electric motor
C
a step-down transformer
D
a step-up transformer
4

A point charge of 6.8 C moves at 6.5 × 104 m/s at an angle of 15° to a magnetic field that has a field strength of 1.4 T.

Question illustration
A
1.6 × 10–1 N
B
6.0 × 10–1 N
C
1.6 × 105 N
D
6.0 × 105 N
5

Yoon Ki investigates electromagnetic induction by moving a bar magnet into a coil of wire. His experimental setup is shown.

Question illustration
A
moving the magnet faster
B
using more loops of wire in the coil
C
using the south pole of the magnet
D
connecting the galvanometer to the coil
6

How should he position the pipe cleaners? Check all that apply.

A
They should exit the box at N and enter at S.
B
They should exit the box at S and enter at N.
C
They should be put inside the box so the two ends join.
D
None should be put inside the box.
E
They should form loops outside of the box over the top, bottom, and sides of the box.
F
They should form loops outside of the box, but over only the sides of the box.
7

Which is true of a step-down transformer but not a step-up transformer?

A
The core is made of copper and the coils are made of iron.
B
The core is made of iron and the coils are made of copper.
C
The primary winding has fewer coils than the secondary winding.
D
The primary winding has more coils than the secondary winding.
8

Lidia makes a graphic organizer to compare temporary magnets with permanent magnets.

Question illustration
A
X: Maintains magnetic properties in the presence of another magnetY: Is made from magnetically hard ferromagnetic material
B
X: Repels or attracts other magnetsY: Attracts iron objects
C
X: Maintains magnetic properties in the presence of another magnetY: Is made from magnetically soft ferromagnetic material
D
X: Attracts or repels iron objectsY: Attracts other magnets
9

A force of 1.5 × 102 N is exerted on a charge of 1.4 × 10–7 C that is traveling at an angle of 75° to a magnetic field.

A
8.2 × 102 T
B
8.5 × 102 T
C
3.2 × 103 T
D
6.4 × 1010 T
10

While researching magnetic fields, Marisa finds several online sites that describe a fictitious north monopole that is a magnet with only a north pole. Although it does not exist, the north monopole is used to describe magnetic field lines.

A
The field lines around a magnet point from the south pole to the north pole to show the direction opposite to the magnetic force on the monopole.
B
The field lines around a magnet point from the south pole to the north pole to show the direction of the magnetic force on the monopole.
C
The field lines around a magnet point from the north pole to the south pole to show the direction opposite to the magnetic force on the monopole.
D
The field lines around a magnet point from the north pole to the south pole to show the direction of the magnetic force on the monopole.
11

The diagram shows a nail before and after a procedure was done.

Question illustration
A
It was made to conduct electricity, which caused the domains to randomize and the nail to become nonmagnetic.
B
It was rubbed with a magnet, which caused the domains to line up and the nail to become magnetic.
C
It was struck repeatedly, which caused the domains to randomize and the nail to become nonmagnetic.
D
It was heated, which caused the domains to line up and the nail to become magnetic.
12

A charged particle moves at 2.5 × 104 m/s at an angle of 25° to a magnetic field that has a field strength of 8.1 × 10–2 T.

A
3.7 × 10–5 C
B
4.1 × 10–5 C
C
8.8 × 10–5 C
D
1.0 × 10–4 C
13

Gazala makes the device shown in the diagram and uses it to pick up four paper clips on the point of the nail.

Question illustration
A
reversing the battery
B
reversing the nail and using the nail’s head
C
wrapping the wire around the nail more times
D
unwrapping several loops of the wire from the nail
14

What is the purpose of the metal core in an electromagnet?

A
It is magnetized and induces a current in the solenoid to decrease the magnetic field strength.
B
It is magnetized and induces a current in the solenoid to increase the magnetic field strength.
C
It is magnetized by the field of the solenoid and increases the magnetic field strength.
D
It is magnetized by the field of the solenoid and decreases the magnetic field strength.
15

Which change can make a generator stronger?

A
decreasing the size of the slip rings
B
increasing the size of the slip rings
C
decreasing the number of coils in the armature
D
increasing the number of coils in the armature

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Lab: Circuit Design