magnetic forces and magnetic fields Flashcards
What are the poles of a compass needle?
The compass needle has a north (N) magnetic pole at one end and a south (S) magnetic pole at the other.
What is the behavior of like and unlike magnetic poles?
Like poles repel, and unlike poles attract, similar to electric charges.
it surrounds a magnet and shows the direction of the magnetic force.
magnetic field
How can you determine the direction of a magnetic field?
The direction of the magnetic field is indicated by the north pole of a small compass needle placed at a point in the field.
Right Hand Rule (RHR-1):
Point your fingers in the direction of the magnetic field.
Point your thumb in the direction the charge is moving (its velocity).
Your palm faces in the direction of the magnetic force on a positive charge.
If the charge is negative, the force direction is the opposite of what your palm shows.
What conditions must be met for a charge to experience a magnetic force?
The charge must be moving, and its velocity must be perpendicular to the magnetic field.
hat is the Right Hand Rule No. 1 (RHR-1) used for?
determine the direction of the magnetic force on a moving charge.
What happens if the moving charge is negative?
The magnetic force is in the opposite direction to what your palm faces for a positive charge.
magnitude of the magnetic field formula
index card
B = magnetic field strength,
F = force on the charge,
q = charge,
v = velocity of the charge,
θ = angle between velocity and magnetic field.
What is the SI unit of magnetic field?
Tesla (T)
How is the Tesla (T) defined?
1Tesla=
Newton⋅second/ Coulomb⋅meter
How many Gauss are in 1 Tesla?
1Gauss=1×10 ^−4
Tesla
What direction does the magnetic force always act on a charged particle in a magnetic field?
The magnetic force is always perpendicular to the velocity of the particle and points toward the center of the circular path.
What happens to a current-carrying wire in a magnetic field?
The magnetic force on the wire pushes it to the right.
What is Right-Hand Rule No. 2 used for?
determine the direction of the magnetic field for a current-carrying wire.
How do you apply Right-Hand Rule No. 2?
Curl your fingers into a half-circle, point your thumb in the direction of the current, and your fingers will point in the direction of the magnetic field.
