AP Physics Monday 14.04.01 Agenda Warm Up Warm Up Standards: 2b Objective: SWBAT Agenda Warm Up Homework

Warm Up Agenda Warm Up Collect HW Finish Review AP Physics Tuesday 14.04.01 Warm Up Standards: Electrostatics & Electric Circuits Work Objective: SWBAT solve free response AP problems for tomorrows test. 10Ω 10v 1Ω 5Ω 20Ω Find V,R,&I across each resistor. You don’t need Kirchoff’s Rules Agenda Warm Up Collect HW Finish Review Homework Study for Test

AP Physics Wednesday 14.04.02 Agenda Warm Up Collect HW How much work must be done in order to move a proton from a 10 V potential to a 2 volt potential? How much work would it take if the charge was an electron? Standards: Electrostatics & Electric Circuits Objective: SWBAT take your exam. Agenda Warm Up Collect HW Final Review Day Homework Study for Test

Agenda Warm Up FRQ’s E#20 AP Physics Thursday 14.04.03 Warm Up a. What are the equations for the force, Electric Field, energy, and voltage due to 2 charges? b. What are the equations for the force, electric field, energy, and voltage due to two infinitely long parallel plates. Classify them in a table then compare your answers with your classmates Standards: 2b Electricity Objective: SWBAT solve electricity FRQ’s Agenda Warm Up FRQ’s E#20 Homework E#20

AP Physics Friday 14.04.04 Agenda Warm Up 22nF Electric Circuits FRQ Find the capacitance of a capacitor with a plate separation of 4mm whose plates are 2m x 5m. Standards: Electric Circuits Objective: SWBAT solve ap frq’s Agenda Warm Up 22nF Electric Circuits FRQ Homework E#21 Test Monday Review Answers on Twitter

Kirchoff’s Rules ΣV=0 (Conservation of Energy) A point where three or more wires are joined is called a junction or node. A path connecting two junctions is called a branch. A branch may contain one or more circuit elements and there may be more than two branches between two junctions. ΣI=0 (Currents entering a junction are positive and currents exiting a junction are negative) Current in = Current out ΣV=0 (Conservation of Energy)

Applying Kirchoff’s Rules p.601 Assign a current and direction of current for each branch in the circuit. Identify the current loops and their directions. Apply Kirchoff’s Rule for each loop to give you a unique set of equations. ΣI=0 Apply the loop theorem ΣV=0 using V=IR

1985B3. An electron initially moves in a horizontal direction and has a kinetic energy of 2.0 x 103 electron–volts when it is in the position shown above. It passes through a uniform electric field between two oppositely charged horizontal plates (region I) and a field–free region (region II) before eventually striking a screen at a distance of 0.08 meter from the edge of the plates. The plates are 0.04 meter long and are separated from each other by a distance of 0.02 meter. The potential difference across the plates is 250 volts. Gravity is negligible. E#19 Test Review FRQ

Kirchoff & RC Extra Credit Find the Ceq and the charge across each capacitor when fully charged. #2 only: Find the current (I) and the Req after the capacitors have fully charged. 1. 2. 20V 3μF 5μF 8Ω 3μF 4Ω 12V 15μF 3μF 3μF I Use Kirchoff’s Law to find I1,I2 & I3. 4V 4Ω 2Ω 2V 3. 6Ω 5Ω 10V 4. 5V Answers to be posted Sunday March 30th

E#20 Electrostatics FRQ Review 1989B2. Two point charges, Q1 and Q2, are located a distance 0.20 meter apart, as shown above. Charge Q1 = +8.0μC. The net electric field is zero at point P, located 0.40 meter from Q1 and 0.20 meter from Q2 Determine the magnitude and sign of charge Q2 b. Determine the magnitude and direction of the net force on charge Q1 c. Calculate the electrostatic potential energy of the system. d. Determine the coordinate of the point R on the x–axis between the two charges at which the electric potential is zero. e. How much work is needed to bring an electron from infinity to point R. which was determined in the previous part? a. Q2=-2μC, b) 3.6 N to the right , c) -0.72 J, d) x=0.16m, e) 0 1975B2. Two identical electric charges +Q are located at two corners A and B of an isosceles triangle as shown right. a. How much work does the electric field do on a small test charge +q as the charge moves from point C to infinity, b. In terms of the given quantities, determine where a third charge +2Q should be placed so that the electric field at point C is zero. Indicate the location of this charge on the diagram right. a) W=2kQq/a, b) +2C charge above point C at d=a√(2)

E#21 Electric Circuits Review 1985E2 (modified) In the circuit shown above, i1 and i2 are the currents through resistors Rl and R2, respectively. V1, V2, and Vc are the potential differences across resistor R1 resistor R2 and capacitor C, respectively. Initially the capacitor is uncharged. a. Calculate the current i1, immediately after switch S is closed. Assume switch S has been closed for a long time. b. Calculate the current i2 c. Calculate the charge Q on the capacitor. d. Calculate the energy U stored in the capacitor. a. I=0.006A, b) 0.002A, c)0.01C, d 10J 1990B3. A battery with an emf of 24 volts and an internal resistance of 1 ohm is connected to an external circuit as shown above. Determine each of the following: a. the equivalent resistance of the combination of the 4-ohm, 8-ohm, and 12-ohm resistors b. the current in the 5-ohm resistor c. the terminal voltage, VAC d. the rate at which energy is dissipated in the 12-ohm resistor of the battery e. the magnitude of the potential difference V f. the power delivered by the battery to the external circuit a. 6Ω, b. 2A, c. 22V, d) 12W, e)12V, f) 44W