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Gravity
Physics (75% on test, Ch 7 Section 4)
Terms in this set (21)
Species with only paired electrons are considered _________ because they do not generate a magnetic field and cannot be magnetized.
Diamagnetic
When unpaired electrons have random spins this type of magnetism is called ________. The material as a whole has no net _______. These are weakly attracted by magnetic fields but are not magnets themselves
1. Paramagnets
2. Dipole
When unpaired electrons retain a stable non-random electron spin, it is called a _______. These are considered permanent magnets
1. Ferromagnet
True or false: a north pole and south pole can exist on their own if you cut a magnet in half.
False, if you cut a magnet in half, it will just form two magnets both with N and S poles
Magnetic field lines run from ______ to ______ and are measured in units of ______
1. North
2. South
3. Teslas (T)
One tesla is the magnitude of the magnetic field at which a particle with a charge of one ________ moving perpendicularly to the field at one meter per second experiences a force of one _______. In other words a tesla's unit can be broken up into _______.
1. Coulomb
2. Newton
3. CNm/s
Magnetic fields only exert forces on ________ ________
Moving charges
The strength of the magnetic field equation is:
Strength of the magnetic field is directly proportional to ________ and inversely proportional to the ________
1. Current
2. Distance
The right-hand rule to test which way a magnetic field runs from a wire: Point your right thumb up matching the flow of the _______. The way your fingers wrap around the wire is the magnetic field lines.
Current
Current runs in the _______ direction while electrons flow in the _______ direction of a wire
1. Positive
2. Negative
How would you be shown on paper if a magnetic field is coming towards you or away from you? (Think of an arrow)
True or false: A fast-moving particle will generate a stronger magnetic field than a slow moving particle of equal charge
True, The strength of a magnetic field generated by a moving charge is proportional to the velocity and charge of that particle
What is the equation to figure out the force a magnetic field has on a moving charged particle?
The arrows above some mean they are vector quantities with both direction and magnitude
Force exerted by a magnetic field on a charged particle is maximized when the particle is running ______ to the field, and almost zero when it is running ______ to the field.
1. Perpendicular
2. Parallel
What are the four circumstances that would zero out force exerted by a magnetic field?
1. Magnetic field has a magnitude of zero (duh)
2. Particle is uncharged
3. Particle is at rest
4. Particle is moving exactly parallel to the magnetic field
What is the equation for force of a magnetic field when considering a wire?
The Lorentz force is:
A. The force experienced by an uncharged particle moving through a magnetic field.
B. The net electric and magnetic force experienced by a charged particle.
C. The net electric and magnetic force experienced by an uncharged particle.
D. Another term for the magnetic force
B
When holding a wire, your thumb points in the direction of the flow or charge, your fingers point in the direction of the magnetic field. Straight up from your palm is the direction of a magnetic force given a moving charged particle while the back of your hand and down is the magnetic force given a moving negative charge
Select all properties of a charged particle which, if altered, would affect the acceleration of that particle moving through a magnetic field.
A. Mass
B. Charge
C. Direction of velocity
D. Strength of the magnetic field
A, B, and C
True or false: For any two charged particles moving in the same direction through a magnetic field of constant strength, the faster moving charged particle will experience a greater magnetic force.
False, since they are both running parallel to the field, there is no force on either.
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