Unit 4 - Electricity & Magnetism
Electrostatics - Sub-Unit 4.1
Sub-Unit 4.1 Note Packet
4.1.1 Elementary Charge
- Convert elementary charge charge in coulombs.
- Determine if a particular charge (in either unit) is permissible.
- Determine the charge on an object given the number of electrons and/or protons present on the object.
- Given charge in coulombs, determine excess/deficiency of electrons.
- Know that charge must be conserved in all interactions between objects.
- Understand the reason for charge flow and the way in which charge will redistribute to minimize stored energy.
- Determine the direction of charge flow in a system.
- Determine the final charge on two or more objects after they interact.
- Understand the charge distribution and flow of charge on an electroscope in response to a charge held near its knob or touching its knob.
- Determine the charge on an electroscope based on the response of its leaves to the presence of a charged object.
- Explain whether a set of leaves will converge or diverge based on actions of charged objects near the knob of an electroscope.
4.1.2 Transfer of Charge
- Understand the operation of the Law of Conservation of Charge.
- Explain and sketch the processes of polarization, induction, conduction, grounding, and flow of charge
- Understand objects with like charge repel; objects with unlike charge attract.
- Understand that neutral objects are attracted to any object with charge.
- Determine the charge on an object based on descriptions of tests using charged rods or other objects.
- Explain how the charge on an object can be determined using charged rods or other objects.
4.1.3 Coulomb’s Law
- Understand that the electrostatic force between two objects is directly proportional to their charge and inversely proportional to the distance between them.
- Calculate Fe given two charges and distance between them.
- Determine how electrostatic force is changed by changing the amount of charge on one or both objects.
- Determine how electrostatic force is changed by changing the distance between two charged objects.
4.1.4 Electric Fields
- Determine: the strength of an electric field; force on a charge; or amount of charge using the electric field equation.
- Sketch a graph relating electric field strength to distance.
- Select/sketch diagrams of electric fields near: point charges; systems of point charges; and/or a set of parallel charged plates.
- Determine direction in which the electric field near an object points.
- Compare electric field strengths at different points.
- Determine rate of acceleration for charged objects in electric fields.
- Compare rates of acceleration for charged objects with the same or different masses and/or charges placed in electric fields.
- Select/sketch the path of a charged object as it moves through an electric field.
4.1.5 Electric Potential
- Understand that moving a charged object to a higher electrical potential requires working against an electric field while allowing an electric field to do work results in lower electric potential.
- Determine the amount of electrical potential gained when work is done on a charged object against an electric field.
- Determine the amount of energy needed to move a charged object from a lower electrical potential to a higher one.
- Determine the amount of kinetic energy gained when a charged object is moved by an electric field.
- Determine whether electrical potential energy is being gained or lost in a system.
- Convert joules electron-volts.
Transfer of Charge
Regents Physics: Unit 4 - Electricity & Magnetism