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Announcements

Announcements. EXAM II TOMORROW!! NO New Homework 31.44: P 5 Ω = 20 W, P 20 Ω = 45 W 31.45: r = 0.50 Ω , ε = 9.0 V 31.46 : 60 V Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am Tutorial Learning Center (TLC) hours: M 8-1 pm, 3-6 pm, W 8-1 pm, 2-6 pm

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Announcements

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  1. Announcements • EXAM II TOMORROW!! • NO New Homework 31.44: P5Ω= 20 W, P20Ω= 45 W 31.45: r = 0.50 Ω, ε = 9.0 V 31.46: 60 V • Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am • Tutorial Learning Center (TLC) hours: M 8-1 pm, 3-6 pm, W 8-1 pm, 2-6 pm TR 8-6 pm, F 8-2 pm

  2. CH 29 – Potential & Field Connecting Potential and Field Sources of Electric Potential Finding the E-field from the Potential A Conductor in Electrostatic Equilibrium Capacitance and Capacitors The Energy Stored in a Capacitor CH 30 – Current and Resistance The Electron Current Creating a Current Current and Current Density Conductivity and Resistivity Resistance and Ohm’s Law Outline… CH 31 – Fundamentals of Circuits • Circuit Elements and Diagrams • Kirchhoff’s Laws and the Basic Circuit • Energy and Power • Series Resistors • Real Batteries • Parallel Resistors • Resistor Circuits

  3. Q1 The numbers below indicate the electric potential (in Volts) at different places in a region of space. From this information, we can conclude 100 100 100 100 100 90 90 90 90 90 70 70 70 70 70 20 20 20 20 20 • The E-field points to the right and is constant. • The E-field points down and is constant. • The E-field points up and is increasing downward. • The E-field points down and is decreasing downward. • The E-field points down and is increasing downward.

  4. Q2 If the charge on a parallel-plate capacitor is doubled: • The capacitance is halved. • The capacitance is doubled. • The E-field is halved. • The E-field is doubled. • The surface charge density does not change on either plate.

  5. Q3 Conduction electrons move to the right in a certain wire. This indicates that: • The current and the E-field both point right. • The current and the E-field both point left. • The current points right and the E-field points left. • The current points left and the E-field points right. • The current points left, but the E-field is unknown.

  6. Q4 Of the following, the copper conductor that has the least resistance is • thin, long, hot • thick, short, hot • thick, long, hot • thick, short, cool • thin, long, cool

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