Electromagnetism Flashcards
branch of physics that deals with the relationship between current and magnetism
electromagnetism
danish scientist that concluded that a magnetic field always surrounds a conductor carrying electric current
Oersted
what does a magnetic field surround?
any stream of charged particles, whether in a conductor or in a space
which rule demonstrates the direction of a magnetic field
right hand thumb rule
a coil of wire is known as a
helix
a coil of wire carrying current is known as a
solenoid
a solenoid with an iron bar core is known as
an electromagnet
what does the strength of the electromagnet depend on?
the number of turns, permeability of the core, amount of current in the conductor
As current fluctuates, what else fluctuates?
electromagnetism
the effectiveness of solenoids / electromagnets depends on
diameter of conductor, length of conductor, strength of current
induction of current by a magnetic field
electromagnetic induction
methods of electromagnetic induction (picture these)
move conductor through field, move magnetic lines of force through stationary conductor, vary magnetic flux to cross conductor
the strength of the induced current in electromagnetic induction depends on
strength of the magnetic field around it, speed of the conductor moving through it, angle of travel through magnetic lines, number of turns in the coil
each line of force that a conductor moves through creates
induced current
when a conductor moves through magnetic lines of force at an angle, how is induced current affected?
closer to 90 degrees is stronger, as the conductor gets closer to 180 degrees or parallel to the lines there will be no induced current
