Chapter 30 Flashcards
Where is the magnetic field is 0 T between 2 wires carrying a current in the same direction?
The magnetic field is 0 T half way between the 2 current carrying wires when the current in the 2 wires is the same.
What is the EMF?
This is where there is both a magnetic and electric force on a metal bar where the bar is also moving.
How does a moving magnet being pulled induce a current?
The pulling force of the magnet induces a current on the wire and causes the charges to move.
How is the magnetic force related to the direction of the push or pull of the magnet?
The magnetic force is acting opposite to the direction of the push or pull of the magnet.
How is the internal magnetic field related to the movement of the magnet?
If the magnet is being pulled more of the internal magnetic field is in the loop thus the direction will be determined by the internal magnetic field.
Where does the energy come from?
When a pulling force is applied the conducting bar moves at a constant speed setting the current to move CCW.
What happens if the magnet is moving in the opposite direction?
The current will move in the opposite direction.
Where does the energy go?
The energy generated from the magnet is dissipated over the resistor.
What happens if the magnet is in the loop but not moving it’s just held in place?
Nothing there is no induced current because the magnetic field is not changing.
What are the 3 ways to induce a current?
- ) Bringing an open circuit above another circuit
- ) Pulling/pushing a magnet in or out of the coils
- ) Rapidly pulling a coil of wires out of a magnetic field
What is flux?
The amount of air passing through a loop per second.
What is the magnetic flux?
The total magnetic field passing through a loop or area if the loop is titled at an angle from the field.
What is Lenz’s Law?
If the magnetic flux is changing a magnetic field will be induced by an induced current that opposes the change in the magnetic flux e.g., the flux decreases the induced current will result in a magnetic field that causes the magnetic field to increase.
