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Charge of Protons and Electrons
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MCAT Physics Ch 5
| Question | Answer |
|---|---|
| Coulomb | SI unit of charge |
| Charge of Protons and Electrons | e = 1.60 x 10^-19 C |
| Note About Protons And Electrons | They have different masses |
| Attractive Forces | Forces that opposite charges exert |
| Repulsive Forces | Forces that like charges exert |
| Conducts | Allow the free and uniform passage of electrons when charged |
| Insulators | Resist the movement of charge and will have localized areas of charge that do not distribute over the surface of the material. |
| Coulomb's Law | Gives the mag. of the electrostatic force between two charges. The force vector ALWAYS points along the line connecting the centers of the two charges. |
| Electric Field | Generated by every stationary charge, which can exert forces on other charges |
| Electric Field (in depth) | Ratio of the force exerted on a test charge to the mag. of the charge. |
| Field Lines | Representation of electric field vectors which radiate outward from positive source charges and radiate inward to negative source charges |
| Note About Positive and Negative Test Charges And Field Lines | Positive test charges will move in the direction of the field lines, while negative test charges will move in the direction opp. of the field lines. |
| Electrical Potential Energy | Amount of work required to bring the test charge from indef. far away to a given position in the vicinity of a source charge. |
| Note about two like charges in an system | The electrical potential energy will increase when these two like charges move towards each other, or when two opposite charges move further apart. |
| Note about two opp. charges in a system | The electrical potential energy will decrease when two opp. charges move toward each other or when two like charges move further apart. |
| Electrical Potential | Electrical potential energy per unit charge |
| Note about different points in the space of an electric field surrounding a source charge | They will have different electrical potential values. |
| Voltage (potential difference) | Change in electrical potential that accompanies the movement of a test charge from one position to another. This is path independent, and only depends on initial and final positions of the test charge. |
| Unit for Electrical Potential and Voltage | Volts |
| Note About Test Charges | They will move spontaneously in whatever direction results in a decrease in their electrical potential energy. ex: Pos. test charges move spon. from high potent. to low potent. ex: Neg. test charges from spon. from low potent. to high potent. |
| Equipotential Lines | Designate the set of points around a source charge or multiple source charges that have the same electrical potential. |
| Note About Equipotential Lines and Electric Field Lines | Equipotential lines are ALWAYS perpendicular to electric field lines. |
| Note About Work On DIFFERENT Equipotential Lines | Work will be done when a charge is moved from one equipotential line to another. The work is independent of the pathway taken between the lines. |
| Second Note About Work The SAME Equipotential Lines | Work will be done when a charge is moved from one point on an equipotential line to another point on the same equipotential line. |
| Electric Dipole | Generated by two charges of opposite sign that is separated by a distance, d |
| Note About A Dipole In An External Electric Field | An electric dipole experiences a net torque until it is aligned with the electric field vector. |
| Note About Electric Field And Translational Motion | An electric field will not induce translational motion in the dipole regardless of its orientation with respect to the electric field vector. |
| Magnetic Fields | Fields created by magnets and moving charges. |
| SI Unit For Magnetic Field | Tesla (T: 1 T = 1000 gauss) |
| Diagmagnetic Materials | Possess no unpaired electrons and are slightly repelled by a magnet. |
| Paramagnetic Materials | Possess some unpaired electrons and become weakly magnetic in an external magnetic field. |
| Ferromagnetic Materials | Possess some unpaired electrons and become strongly magnetic in an external magnetic field. |
| Notes About Poles For Magnets And Field Lines | Magnetics have a north and south pole. Field lines point from the north to the south pole. |
| Note About Current-carrying Wires | They create magnetic fields that are concentric circles that surround the wire. |
| Note About External Magnetic Fields | They exert forces on charges moving in any direction except parallel or antiparallel to the field. |
| Note About Point Charges And A Uniform Magnetic Field | Point charges can undergo circular motion in a uniform magnetic field. |
| Centripetal Force | Magnetic force acting on a point charge. |
| Direction of Magnetic Force | Determined using right-hand rule. |
| Lorentz Force | Sum of the electrostatic and magnetic forces acting on a body. |
| Eq. 5.1: Coulomb's Law | Fe = kq1*q2 / r^2. |
| Eq. 5.2: Electric Field | E = Fe / q = kQ / r^2 |
| Eq. 5.3: Electrical Potential Energy | U = kQq / r |
| Eq. 5.4: Electrical Potential (From Electrical Potential Energy) | V = U / q |
| Eq. 5.5: Electrical Potential (From Source Charge) | V = kQ / r. For a positive source charge, V is positive. For a negative source charge, V is negative. |
| Eq. 5.6: Voltage | Del. V = Vb - Va = Wab / q |
| Eq. 5.7: Electrical Potential Near A Dipole | V = (kqd / r^2) * cos(angle) |
| Eq. 5.8: Dipole Movement | p = qd. p is the point from the positive charge toward the negative charge. |
| Eq. 5.9: Electric Field On The Perpendicular Bisector Of A Dipole | E = (1 / 4pi*E0) * (P/r^3) |
| Eq. 5.10: Torque On A Dipole In An Electric Field | T = pE * sin(angle). E = magnitude of the uniform external electric field. |
| Eq. 5.11: Magnetic Field From A Straight Wire | B = u0*I / 2pi*r. B = magnetic field at a distance, r, from the write. U0 is the permeability of free space: 4pi * 10^-7 T*m / A. I = current |
| Eq. 5.12 Magnetic Field From A Loop Of Wire | B = u0I / 2r |
| Eq. 5.13 Magnetic Force On A Moving Point charge | FB = qvB * sin(angle). q = charge, v = mag. of velocity, B = mag of magnetic field, angle = smallest angle between vector v and the magnetic field vector B. |
| Eq. 5.14 Magnetic Force On A Current-Carrying Wire | FB = ILB * sin(angle). I = current, L = length of wire, B = mag of magnetic field, angle = angle between L and B. |
Created by:
SamB91
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