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(II) A wire, in a plane, has the shape shown in Fig. 28–43, two arcs of a circle connected by radial lengths of wire. Determine
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Chapter 28 Solutions
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Physics: Principles with Applications
- (I) How many coulombs are there in a 75 ampere-hour carbattery?arrow_forward(II) Electrocardiographs are often connected as shown in Fig. 19–68. The lead wires to the legs are said to be capac- itively coupled. A time constant of 3.0 s is typical and allows rapid changes in potential to be recorded accurately. If C = 3.0 µF, what value must R have? [Hint: Consider each leg as a separate circuit.] - To left-leg C electrode R Recorder - To right-leg electrode (ground) R C GURE 19-68 ·To arm electrode oblem 53. Amplifierarrow_forward(II) A rectangular loop of wire is placed next to a straight wire, as shown in Fig. 20-55. There is a current of 3.5 A in both wires. Deter- 3.5 A mine the magnitude and direction of the net force on the loop. 3.5 A 3.0 cm 5.0 cm FIGURE 20-55 Problem 31. 10.0 cm-arrow_forward
- (a) Two long parallel wires, each 2.0 mm in diameter and 9.00 cm apart, carry equal 1.0-A currents in the same direc- tion, Fig. 20-75. Determine B along the x axis between the wires as a function of x. (b) Graph B vs. x from x = 1.0 mm to x = 89.0 mm. y -d = 9.00 cm – I FIGURE 20–75arrow_forwardSuspending Suspending a wire with a current. A horizontal wire carries a current I1 = 80 A dc. A second parallel wire 20 cm below it (Fig. 28-7) must carry how much current I2 so that it doesn't fall due to gravity? The lower wire has a mass of 0.12 g per meter of length.arrow_forward(I) An electric car uses a 45-kW (160-hp) motor. If the battery pack is designed for 340 V, what current would the motorneed to draw from the battery? Neglect any energy lossesin getting energy from the battery to the motor.arrow_forward
- Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?arrow_forward(III) At a point high in the Earth's atmosphere, He2+ ions in a concentration of 2.4 × 1012/m³ are moving due north at a speed of 2.0 × 10° m/s. Also, a 7.0 × 101/m³ con- centration of 0, ions is moving due south at a speed of 6.2 × 10° m/s. Determine the magnitude and direction of the net current passing through unit area (A/m²).arrow_forwardII) For the transmission of electric power from power plantto home, as depicted in Fig. 21–25, where the electric powersent by the plant is 100 kW, about how far away could thehouse be from the power plant before power loss is 50%?Assume the wires have a resistance per unit length of 5 x10-5Ω /marrow_forward
- (a) — (b) — (c) O O Od>c>b> a Ob>d>a> c (d) — Ø The figure shows four arrangements in which long, parallel, equally spaced wires carry equal currents directly into or out of the page. Rank the arrangements according to the magnitude of the net force on the central wire due to the currents in the other wires, greatest first. Od>b>c> a Ob>a>c>d Ob>d>c> a & Ⓡ Ⓡ Oarrow_forward(III) A 10.0-m length of wire consists of 5.0 m of copperfollowed by 5.0 m of aluminum, both of diameter 1.4 mm.A voltage difference of 95 mV is placed across the compositewire. (a) What is the total resistance (sum) of the two wires?(b) What is the current through the wire? (c) What are thevoltages across the aluminum part and across the copper part?arrow_forwardII) A 4.80-m length of 2.0-mm-diameter wire carries a750-mA dc current when 22.0 mV is applied to its ends. If thedrift velocity is 1.7X 10-5 m/s determine (a) the resistance Rof the wire, (b) the resistivity p and (c) the number n offree electrons per unit volume.arrow_forward
- College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College