A 16-cm-long nichrome wire is connected across the terminals of a 1.5 V battery. • Part A What is the electric field inside the wire? Express your answer with the appropriate units. HẢ E = Value Units Submit Request Answer • Part B What is the current density inside the wire? Express your answer with the appropriate units. ? J = Value Units
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- A potential difference, V, is applied across the length of a conducting wire with resistivity, p, radius, r, and length, L. (a) Write symbolic expressions for the following in terms of V, p, r, and L (ONLY and as needed), along with any constants. • Electric Field Strength: E = • Resistance: R = • Current: I = • Current Density: J = (b) Combine the equations above to obtain symbolic expressions for the current and current density in terms of V, E, R, and p (ONLY and as needed). Don't look it up! See how it all fits together! || • J=+ How a Real Voltmeter Works 4 of 20 I Review | Constants Part A Unlike the idealized voltmeter, a real voltmeter has a resistance that is not infinitely large. A voltmeter with resistance Ry is connected across the terminals of a battery of emf E and internal resistance r. Find the potential difference Vmeter measured by the voltmeter. • View Available Hint(s) ? Vmeter = Submit Previous Answers Part B Complete previous part(s) Next > Provide FeedbackĀ QUESTION 1 Five cylindrical wires are made of the same material. Their lengths and radii are wire 1: length f, radius r wire 2: length 38/2, radius r/2 wire 3: length f/2, radius r/2 wire 4: length , radius r/2 wire 5: length 5, radius r/2 Rank the wires according to their resistances, least to greatest. OA. 1, 3, 4, 2, 5 OB. 1 and 2 tie, then 5, 3, 4 OC. 1, 2, 3, 4, 5 OD. 5, 4, 3, 2, 1 OE. 1, 2, 4, 3, 5 JURITY WY
- P Performance Matters Welcome, Bertiana! ► || A Tools - Question 2 of 51 Submit Test 04.CFE.2003380.2003390.2003836.2003840.Phy... A cell phone will typically have a power output of 1.4 watts when playing a song that lasts for 300 seconds. If the electrical resistance of the cellphone is 400 Q, what is the total charge needed to play the song?Part A What is the resistance of a 1700 W (120 V) hair dryer? ? Ω Submit Request Answer Part B What is the current in the hair dryer when it is used? ? A Submit Request AnswerPart A A wire of length L and cross-sectional area A has resistance R What will be the resistance Rstretched of the wire if it is stretched to twice its original length? Assume that the density and resistivity of the material do not change when the wire is stretched. Express your answer in terms of the wire's original resistance R. • View Available Hint(s) Rstretched = Submit
- Part A Variations in the resistivity of blood can give valuable clues about changes in various properties of the blood. Suppose a medical device attaches two electrodes into a 2.0-mm-diameter vein at positions 5.1 cm apart. What is the blood resistivity if a 9.0 V potential difference causes a 210 µA current through the blood in the vein? HA ? p = Value Units Submit Request AnswerPart B What is the resistance R3? Express your answer with the appropriate units. µA ? R3 Value %3DBattery R₁ R₂ R3 In the circuit above, a 19 V battery is connected to the circuit where R₁ = 30, R₂ = 38 , and R3 = 35 2. What is the current flowing through R₂ in this circuit? • Do NOT include units • Round to 2 decimal points, include zeros if needed. M w M
- Hill+ R1 -M 9V ww R2 The first resistor has a value of 46 and the second resistor has a value of 43 2. What is the voltage at the first resistor? • Do NOT include units • Round to the hundredths placePart a-cTwo resistors are connected in series to a battery with an emf of 12 V. The voltage across the first resistor is 2.8 V and the current through the second resistor is 0.17 A. Part A Find the resistance of the first resistor. Express your answer using two significant figures. R₁ Submit Part B [5] ΑΣΦ Request Answer Find the resistance of the second resistor. Express your answer using two significant figures. ? Ω