Answers TX-Physics BMagnetic Field and Force

Magnetic Field and Force — Unit test Answers

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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.

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.

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.

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.

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.

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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.

3.7 × 10–5 C

4.1 × 10–5 C

8.8 × 10–5 C

1.0 × 10–4 C

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.

8.2 × 102 T

8.5 × 102 T

3.2 × 103 T

6.4 × 1010 T

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

They should exit the box at N and enter at S.

They should exit the box at S and enter at N.

They should be put inside the box so the two ends join.

None should be put inside the box.

They should form loops outside of the box over the top, bottom, and sides of the box.

They should form loops outside of the box, but over only the sides of the box.

Which device converts kinetic energy into electrical energy?

an electric generator

an electric motor

a step-down transformer

a step-up transformer

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.

X: Thumb, for velocityY: Fingers, for magnetic fieldZ: Palm of hand, for force

X: Back of hand, for forceY: Thumb, for velocityZ: Palm of hand, for force

X: Palm of hand, for forceY: Thumb, for velocityZ: Fingers, for magnetic field

X: Palm of hand, for forceY: Fingers, for magnetic fieldZ: Back of hand, for force

[BLANK]

electromagnetism

electromagnetic induction

electromagnetic spectrum

electromagnetic force

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

The core is made of copper and the coils are made of iron.

The core is made of iron and the coils are made of copper.

The primary winding has fewer coils than the secondary winding.

The primary winding has more coils than the secondary winding.

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

It is magnetized and induces a current in the solenoid to decrease the magnetic field strength.

It is magnetized and induces a current in the solenoid to increase the magnetic field strength.

It is magnetized by the field of the solenoid and increases the magnetic field strength.

It is magnetized by the field of the solenoid and decreases the magnetic field strength.

Trent builds a model electric motor. When he connects a battery to the motor, the motor spins through a half rotation and stops.

replacing the battery, because it is not providing current

installing new brushes, because they are not making a good connection

checking the commutator, because the current is not reversing

adding more wire coils in the armature, because the electromagnet is too weak

Which change can make a generator stronger?

decreasing the size of the slip rings

increasing the size of the slip rings

decreasing the number of coils in the armature

increasing the number of coils in the armature

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

It was made to conduct electricity, which caused the domains to randomize and the nail to become nonmagnetic.

It was rubbed with a magnet, which caused the domains to line up and the nail to become magnetic.

It was struck repeatedly, which caused the domains to randomize and the nail to become nonmagnetic.

It was heated, which caused the domains to line up and the nail to become magnetic.

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

X: Maintains magnetic properties in the presence of another magnetY: Is made from magnetically hard ferromagnetic material

X: Repels or attracts other magnetsY: Attracts iron objects

X: Maintains magnetic properties in the presence of another magnetY: Is made from magnetically soft ferromagnetic material

X: Attracts or repels iron objectsY: Attracts other magnets

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.

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.

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.

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.

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.

1.6 × 10–1 N

6.0 × 10–1 N

1.6 × 105 N

6.0 × 105 N