Term
| Equation that describes the electrostatic force between two charges |
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Definition
Coloumb's Law
Fe = kq1q2/r2
Fe is the magnitude of the electric force
k is Coloumb's constant
q is the magnitude of the 2 charges
r is the distance between them
like charges will repulse and opposite charges will attract
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Term
| Equation that describes the strength of an electric field |
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Definition
E = Fe/q = kQ/r2
E is the electric field in N/C
Fe is magnitude of force felt by test charge q
Q is the source charge |
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Term
| Equation for electric potential energy |
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Definition
Ue=kQq/r
Ue is the electric potential energy
k is coloumb's constant (9 x 109)
Q is the source charge magnitude
q is the point charge magnitude
r is the distance between the two
Charges that repel each other (+/+ or -/-) equal a positive potential energy. Charges that attract represent a negative potential energy (as radius increases potential energy increases because U gets closer to zero) |
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Term
| Equation for magnetic field strength |
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Definition
Straight wire, B = μ0I/(2πr)
B is magnetic field strength in Tesla (T)
μ0 is the permeativity of free space
I is the current through the wire
r is the distance from the wire
Wire in a circle, B = μ0I/(2r)
Same except r represents the radius of the circle and it calculates the magnetic field at the very center of it. |
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Term
| What is the right hand rule in regards to determining magnetic field direction? |
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Definition
| The thumb of your right hand points in the direction that current is flowing and when you wrap your hand around the wire that is the direction the magnetic field is going. |
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Term
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Definition
F = qvBsinΘ
F is the magnetic force
q is the magnitude of the charge
v is the velocity of the charge
B is the magnitude of the magnetic field
This means that if the charge is not moving or there is no magnetic field, there will be no magnetic force. Also, if the angle the charge is moving in relation to the field is 0 or 180 degrees (with or against the magnetic field) the force will be zero. |
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Term
| What is the right hand rule for determining the direction of magnetic force |
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Definition
Only works for positive charges. Point your thumb in the direction of the charges movement and your fingers in the direction of the magnetic field. The direction your palm is now facing is the direction of the magnetic force. For negative charges the force will be in the opposite direction.
Magnetic force is also centripetal. The particle will move in circles. |
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Term
| How can you change Coulomb's law (electrostatic force) to calculate electric field, electrical potential energy and electrical potential? |
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Definition
Coulomb's law: Fe = kq1q2/r2
Electric field: E = Fe/q = kQ/r2
Electrical potential energy: U = kQq/r = Fr
Electrical potential: V = kQ/r = Fr/q = U/q |
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Term
| What is the equation for electric field? |
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Definition
Electric field: E = Fe/q = kQ/r2
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Term
| What is the equation for electrical potential energy? |
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Definition
Electrical potential energy: U = kQq/r = Fr
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Term
| What is the equation for electrical potential? |
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Definition
| Electrical potential: V = kQ/r = Fr/q = U/q |
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Term
| What are diamagnetic material? |
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Definition
| materials made of atomes with no unpaired electrons and have no magnetic field |
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Term
| What are paramagnetic materials? |
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Definition
| have unpaired electrons and becomeweakly magnetized in presence of an external magnetic field |
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Term
| What are ferromagnetic materials? |
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Definition
| have unpaired electrons and will become strongly magnetized in magnetic field |
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Term
| What determines if a nucleus will have a magnetic moment? |
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Definition
| A nucleus with an odd number of either protons and/or neutrons will have a nonzero magnetic moment. Any nucleus with an even number of protons and an even number of neutrons will have a magnetic moment of zero. |
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