PHY 182 1st Edition Lecture 14Outline of Last Lecture I. Line of ChargeII. Rings and DisksIII. Infinite PlaneOutline of Current Lecture I. Charges in an Electric FieldII. Electric dipolesCurrent LectureCharges in an Electric Field- A positive charge will encounter a force that is in the same direction as the electric field. A negative charge will encounter a force in the opposite direction as the electric field. - This force is equal to the charge (in coulombs) multiplied by the magnitude of the electric field.- Acceleration is constant for a particle in a uniform electric field and not constant for a particle in a non-uniform electric field. Therefore, you can only use kinematic equations when dealing with a uniform electric field because the equations don't apply to situations in which acceleration is not constant.- If an electron and proton are both placed in the same electric field, the proton will have a smaller acceleration because of its larger mass and thus will have a less altered trajectory.- Uniform electric fields occur in situations such as a parallel plate capacitor. Non-uniform electric fields are produced by point charges.Electric Dipoles- The net force on a dipole in a uniform electric field is zero.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- There is, however, a net torque. So the dipole will not move like a particle would but it will rotate.- Torque = pEsin(ϕ) (ϕ is the angle between the direction of the electric field and the direction of the electric dipole moment.)- Torque can also be found by calculating the cross product of the dipole moment and the electric field.- The electric dipole moment points in the direction from negative to
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