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8 Cards in this Set

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  • Back
What are the two poles of a magnet? How do they interact with one another?
Every magnet has a N and S pole. The N and S poles attract. N-N and S-S poles repel.
What happens when you split a permanent magnet into smaller pieces?
Each of those new piece will become a permanent magnet with N-S poles.
Name 3 things that produce magnetic fields?
(1) Permanent magnets, (2), Moving charges, and (3) currents.
What is the symbol for magnetic field?
B (with a vector arrow)
What do magnetic field lines indicate? How do they point?
Magnetic field lines point from N to S. The magnetic field (B) at a point on a magnetic field line is tangent to that point.
What is the formula for magnetic force? What are the corollaries?
F,b = |q| * V * B * sin(ϴ)

When the charge isn't moving (V=0), the magnetic force acting on it = 0.
If the V is parallel to B, ϴ=0, so sin(ϴ)=0, so B=0.
Mangnetic forces do not act on uncharged objects.
|q| means that the magnetic force is the same regardless of the charge on that object.
What does ϴ indicate in the magnetic force equation?
ϴ indicates the displacement between V And B.
What is the right hand rule for determining the direction of the magnetic force? What must you keep in mind?
Align V and B in the same plane. Notice that there is an angle (ϴ) between them. Notice that you could rotate V either clockwise or counterclockwise to overlap with B. Notice that one kind of rotation results in a shorter route. Choose that one. Imagine a line perpendicular to both V and B. Using your right hand, grab that imaginary line like a bar in a way such that your four fingers curl in the direction you rotated V. Your thumb will either be pointing up or down.

If the charge is positive, the force is in the direction of your thumb. If the charge is negative, vice versa.