Electromagnetism Study Flashcards
This acts as a magnet when it carries a current.
Solenoid
When you insert an iron rod through the center of the coil of a solenoid, the magnetic field is increased and now you have a(n)
Electromagnet
The strength of the magnetic field surrounding an electromagnet depends on the:
- Strength of the applied current
- Number of turns in the wire
- Presence or absence of an iron core
By running a current through a coil of wire, we can create a(n)
Magnetic Field
We can create a current by moving a wire in and out of a magnetic field, which is called
“Induced Current
The process of inducing a current in a circuit with a changing magnetic field is called
Electromagnetic Induction
There is NO current if the loop is _______ or the magnetic field is _________
If loop is STATIC or
Magnetic field is CONSTANT
Three ways of inducing current in a circuit:
- The circuit is IN AND OUT of the magnetic field (either the circuit or the magnet is moving).
- The circuit is ROTATED in the magnetic field.
- The intensity of the magnetic field is VARIED.
Potential energy used to turn the loop in a magnetic field is converted to electric energy
Generator
Almost identical in construction to a DC generator. Instead, electric energy is converted to mechanical energy.
Motor
The south magnetic pole is oriented near _________
Geographic North
Magnetic poles always occur in _______
Pairs
Magnetic poles cannot be ________ like electric charges – no matter how many times a permanent magnet is cut, each piece will always have a ___________________
cannot be ISOLATED
will always have a NORTH AND SOUTH POLE
A permanent magnet retains its magnetic properties in the absence of an _______________________
Inducing field or Current
________________ objects can be magnetized by placing them near a strong permanent magnet. The process can be easily reversed.
UN-MAGNETIZED objects
The force associated with charged particles, which has two aspects: electric force and magnetic force
Electromagnetic force
The ________________ is when you point thumb of right hand in direction of current, your fingers curve in the direction of the magnetic field
“Right Hand Rule”
