MCAT Magnetism Flashcards
What generates magnetic fields? What does magnetic field lines represent?
Moving charge. Magnetic field lines represent the direction charged objects move when placed in it.
Continous field lines that comes out of north pole and into the south pole.
Increased density = greater the force, decreased density = less the force.
Magnets.
Objects that has magnetic fields. They have poles, north and south which attract each other. The same poles repel each other.
What is the SI unit for magnetic force?
The tesla ( T).
Describe how the compass interacts with earth’s poles?
For earth the top of the earth is the south pole while the bottom of the earth is the north pole.
The magnetic south pole corresponds to the earth’s geographic north pole. Magnetic north pole corresponds to earth’s geographic south pole.
What is the lorentz force
The magnitude of the force a charged object placed in an external magnetic field feels.
F = qvB ( sin theta) or just qvB
SI unit is N/A.m ( Newton/ ampere- meter)
The force and velocity vectors are perpendicular to each other.
When to use the right hand rule
When we want to find force, velocity, or strength of magnetic field when given other parameters.
Lay palm out. Thumb is velocity and fingers is strength of magnetic field. Force comes out of palm for positive charges and the directly from behind the palm for negative charges.
What direction does charge objects move in a magnetic field?
A circular path. Kept on that path through the centripetal force.
Centripetal force = (m)*(v^2)/ r
How to use right hand rule 2
Charged objects in a wire created their own magnetic field. To find we curl our hand around the wire with our thumb representing the current and our fingers representing the magnetic field.
