D3 - Motion in electromagnetic fields Flashcards
what are magnets
Magnetic materials have the ability to attract or other types of magnetic materials
which charges attract and repel
attract -> opposite
repel -> like
what happens when you break a magnet in half
It creates two magnets, each with its own north and south pole
what do the domains of a magnet have to do for it to become magnetic
the domains have to be aligned by an external magnetic field. If enough of the material’s domain becomes aligned, the material forms a magnetic dipole and becomes a permanent magnet
What is magnetic flux density + Units
the magnetic field strength in Tesla (T)
in what direction do the field line for a magnet go? and how might this change for a horseshoe magnet
north to south. A horseshoe magnet is just a bent bar magnet 🧲 , so the rules still apply
how do you do the right hand rule
wrap your hand in a thumbs up sign around the wire in the direction of the current, the other four fingers will point in the direction of the magnetic field
What is an annotation for into and out of the paper for a magnetic field
into the paper is represented by X holidayand represented by a dot
Where is the magnetic flux density the highest
Closer to the wire
Where the magnetic field strongest wire that is in a loop
Wire loop strong magnetic field inside the loop than outside
How do you use the right hand rule for an electromagnet
If you cut your fingers in the direction of the current around the metal core you’ll make a thumbs-up sign, we your thumb is pointing towards the north pole of the electromagnet.
name 3 electromagnetic applications
– Use in a bullet train to levitate it therefore there is no friction
– using a toaster to heat bread
– use in speakers and microphones to provide a push force that pushes the speaker/headphones in and out to create sound
How would you find the field lines of a magnet
Use a plotting compass and draw the lines around from north to south pole
What are the factors that affect the strength of an electromagnet
– number of coils
– current
– iron core
what is the third right hand rule
Thumb points in direction of the current
Fingers point indirect of field lines
Palm points indirect of force
