Term
| Force on a moving charged particle |
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Definition
F = qv x B = qvBsinΘ, where theta is the angle between the velocity V and field B |
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Term
| What are the units of a tesla? |
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Definition
| 1 T = 1 N/(C m/s) = 1 N/(A m) |
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Definition
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| If the velocity vector of a positive charge is in the +x direction, and the B field is in the -Y direction, which direction is F? |
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Definition
| -Z direction, according to the right hand rule |
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Term
| If the velocity vector of a negative charge is in the +x direction, and the B field is in the -Y direction, which direction is F? |
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Definition
+ Z. The RHR dictates that the force will be in the -Z direction, but because the charge is negative, F=qV x B the force is in the negative direction of the RHR |
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Term
| What is the magnetic force on a straight segment of current-carrying wire? |
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Definition
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Term
What is the magnetic force on a current element? |
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Definition
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Term
What is a cyclotron period? |
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Definition
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Term
| What is a cyclotron frequency? |
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Definition
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Term
| What is the velocity selector? |
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Definition
v = E/B It is set up as two capacitor plates with a constant electric field between them. The E field is perpendicular to a B field. If a particle is moving at a certain velocity, the E field will balance out the B field that is created by the particle. Only a charge of that velocity can move through the capacitors undeflected |
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Term
What is the magnitude of torque on a rectangular current loop? |
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Definition
τ = NIABsinΘ Where N = the number of loops I=current A = area enclosed by loop B = B field sinΘ = angle between B field and the orientation of the loop 'n' (found by RHR, fingers curl around direction of I, thumb points to n) |
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Term
| What is the magnetic dipole moment of a current loop? |
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Definition
μ = NIAn N = number of loops I = current A = area n = see card 11 |
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Term
| What is the torque on a current loop? |
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Definition
τ = μ x B All vector units |
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Term
| What is the potential energy of a magnetic dipole? |
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Definition
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Term
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Definition
| When charges are traveling in a conducting wire in a B field perpendicular to their velocity, charges will be pushed to one side because of the force the B field exerts on them. The separation of charge is the Hall effect |
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Term
| What is the Hall voltage? |
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Definition
VH = EH ω = vd Bω ω = width of the strip that the potential difference is being measured. Vd = drift velocity of electrons in a wire EH = the electric field created by the separation of charges |
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Term
| Why is there a Hall voltage? |
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Definition
| A Hall voltage exists because when a magnetic field pushes like charges to one end of a wire or strip, there is a difference in voltage between the top of the wire, which holds one type of charge, and the bottom of the wire, which holds the opposite charge. This difference in charge can be measured |
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