# Shared Flashcard Set

## Details

Physics Ch. 5 - Electrostatics and Magnetism
MCAT
15
Physics
04/04/2016

Term
 Equation that describes the electrostatic force between two charges
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
Term
 Equation that describes the strength of an electric field
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
Term
 Equation for electric potential energy
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)
Term
 Equation for magnetic field strength
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.
Term
 What is the right hand rule in regards to determining magnetic field direction?
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.
Term
 magnetic force equation
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.
Term
 What is the right hand rule for determining the direction of magnetic force
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.
Term
 How can you change Coulomb's law (electrostatic force) to calculate electric field, electrical potential energy and electrical potential?
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
Term
 What is the equation for electric field?
Definition
 Electric field: E = Fe/q = kQ/r2
Term
 What is the equation for electrical potential energy?
Definition
 Electrical potential energy: U = kQq/r = Fr
Term
 What is the equation for electrical potential?
Definition
 Electrical potential: V = kQ/r = Fr/q = U/q
Term
 What are diamagnetic material?
Definition
 materials made of atomes with no unpaired electrons and have no magnetic field
Term
 What are paramagnetic materials?
Definition
 have unpaired electrons and becomeweakly magnetized in presence of an external magnetic field
Term
 What are ferromagnetic materials?
Definition
 have unpaired electrons and will become strongly magnetized in magnetic field
Term
 What determines if a nucleus will have a magnetic moment?
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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