Answers Physics in the UniverseElectromagnetism

Practice Test Answers

17 verified answers1 views

Free Preview

Which labels belong in the regions marked X, Y, and Z?

X: Palm of hand, for force Y: Thumb, for velocity Z: Fingers, for magnetic field

X: Palm of hand, for force Y: Fingers, for magnetic field Z: Back of hand, for force

X: Thumb, for velocity Y: Fingers, for magnetic field Z: Palm of hand, for force

X: Back of hand, for force Y: Thumb, for velocity Z: Palm of hand, for force

Free Preview

Which labels belong in the regions marked X and Y?

X: Uses turbines to turn generators Y: Boils water to form steam

X: Uses generators to produce electrical energy Y: Burns fuel to form steam

X: Boils water to form steam Y: Uses turbines to turn generators

X: Uses uranium Y: Uses falling water to turn turbines

Which label belongs in the region marked X?

Protons move

Electrons move

Charged object must touch

Charged object must not touch

What change would most improve his results?

using more loops of wire in the coil

moving the magnet faster

using the south pole of the magnet

connecting the galvanometer to the coil

Which statement best explains what was likely done to the nail?

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.

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

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

What are used to transfer electrical energy from a power plant all the way to a home?

power transformers

power lines

turbines

generators

Yellow light has a frequency of 5 point 2 times 10 to the 14th power Hz and travels at a speed of 3.0 meters meters per second What is the wavelength of yellow light, in meters?

2 point 2 times 10 to the negative 6 power m

8 point 2 times 10 to the 22th power m

5 point 8 times 10 to the negative 7 power m

1 point 7 times 10 to the 6th power m

Charges of plus 3 µC and negative 5 µC are 2 mm from each other. The negative 5 µC charge is replaced with a plus 5 µC charge. How will the electrical force between the charges compare with the original force?

same force, but in the same direction

same force, but in the opposite direction

greater force, but in the same direction

greater force, but in the opposite direction

A point charge is used to determine the electric field around a charged particle. Why is it necessary that the point charge does not affect the position of the charge being tested?

Electric fields are inversely proportional to the square of the distance, so any change in position changes the field.

The amount of charge will increase if the charged particle moves closer to the point charge, so any change in position changes the field.

Electric fields are directly proportional to distance, so any change in position changes the field.

The amount of charge will decrease if the charged particle moves closer to the point charge, so any change in position changes the field.

Which lists the waves in order of wavelength, from longest to shortest?

infrared, visible light, gamma rays

cap x -rays, infrared, radio waves

radio waves, gamma rays, visible light

ultraviolet, microwaves, visible light

Trent builds a model electric motor. When he connects a battery to the motor, the motor spins through a half rotation and stops. Which is the most likely solution to the problem?

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

replacing the battery, because it is not providing current

checking the commutator, because the current is not reversing

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

A charged particle moves at 2 point 5 times 10 to the 4th power m/s at an angle of 25 degrees to a magnetic field that has a field strength of 8 point 1 times 10 to the negative 2 power T If the magnetic force is 7 point 5 times 10 to the negative 2 power N , what is the magnitude of the charge?

8 point 8 times 10 to the negative 5 power cap c

1 point 0 times 10 to the negative 4 power cap c

4 point 1 times 10 to the negative 5 power cap c

3 point 7 times 10 to the negative 5 power cap c

Which device converts kinetic energy into electrical energy?

a step-down transformer

an electric generator

an electric motor

a step-up transformer

If the distance between two charges is increased to three times the original distance, how will the electrical force between the charges compare with the original force?

It will decrease to one-ninth the original force.

It will increase to nine times the original force.

It will increase to three times the original force.

It will decrease to one-third the original force.

Which labels belong in regions X, Y, and Z?

X: Points away from the charge Y: Points in the direction of the force on the positive charge Z: Points toward the charge

X: Points toward the charge Y: Points in the direction of the force on the negative charge Z: Points away from the charge

X: Points away from the charge Y: Points in the direction of the force on the negative charge Z: Points toward the charge

X: Points toward the charge Y: Points in the direction of the force on the positive charge Z: Points away from the charge

What are the correct labels for the image?

W: Positive X: Negative

W: Negative X: Positive

W: Positive X: Positive

W: Negative X: Negative

Which labels belong in the regions marked X and Y?

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

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

X: Attracts or repels iron objects Y: Attracts other magnets

X: Repels or attracts other magnets Y: Attracts iron objects

Did you find these answers helpful?

Practice Test Answers

More from this Course

TRY EDGENUITY HACKS