Unit 6: Science Flashcards
What are the materials that are most likely to become magnetized?
Iron
Nickel
What is a magnetic field?
A field produced by a magnetic objects that exerts a force on other magnetic materials or moving electric charges
If you apply mechanical rotational force to a DC motor, what would happen?
The DC motor will generate electricity
What determines the strength of an electromagnet?
Amount of current
Amount of coil around the ferromagnetic material
Which of the following are required to make a magnet?
Half-filled electrons
Aligned magnetic domain
Aligned atoms
When the armature is oriented perpendicular to the magnetic field (vertical) what is true about it
There are both current and magnetic force in the armature
Earth’s magnetic field is crucial because it…
Protects from solar winds
What does Oersted’s Law state?
An electric current produces a magnetic field
What do paired electrons in an atom have?
Net Neutral Charge
The entire atom has north and south poles and a magnetic field due to what?
Spinning of electrons
Which one describes the difference between the geographical poles and magnetic poles?
Geographic poles are fixed, and magnetic poles shift
What is the main difference between permanent magnets and electromagnets?
Permanent magnet do not require electricity
What is the primary characteristic of a permanent magnent?
Long-Lasting Magnetization
A coil of carrying-wire is called a…
Solenoid
Materials with regions where the north and south poles are aligned in one general direction are called BLANK materials?
Ferromagnetic
Natural magnets, such as lodgestone, have magnetic domains that naturally align with what?
Earth’s magnetic field
What are the differences between Faraday’s Law and Oersted’s Law
Faraday’s Law states that a magnetic field can produce current, while Oersted’s Law states that current can produce a magnetic field
Permanent magnets are used in BLANK?
Electric motors
An MRI works by…
Using magnetic fields and radio waves to create images of the body
The Earth’s magnetic field is a result of what….
Electric currents
The region around a magnet where magnetic forces act is called the BLANK
Magnetic Field
How does alternating current differ from direct current?
Alternating current changes periodically while direct current stays the same
A magnet has two poles, what is it called?
North and South
Where is the strongest point on the magnet?
At the poles
