•3 SSM www In Fig. 30-34, a 120- turn coil of radius 1.8 cm and resist- ance 5.3 0 is coaxial with a solenoid of 220 turns/cm and diameter 3.2 cm. Coil The solenoid current drops from 1.5 A to zero in time interval At = Solenoid 25 ms. What current is induced in the coil during Ar? Figure 30-34 Problem 3.

•3 SSM www In Fig. 30-34, a 120- turn coil of radius 1.8 cm and resist- ance 5.3 0 is coaxial with a solenoid of 220 turns/cm and diameter 3.2 cm. Coil The solenoid current drops from 1.5 A to zero in time interval At = Solenoid 25 ms. What current is induced in the coil during Ar? Figure 30-34 Problem 3.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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•1 In Fig. 30-33, a circular loop of wire 10 cm in diameter (seen edge-on) is placed with its normal N at an angle 0 = 30° with the direction of a uniform magnetic field B of magnitude 0.50 T. The loop is then rotated such that N ro- -Loop tates in a cone about the field direction at the Figure 30-33 rate 100 rev/min; angle 6 remains unchanged during the process. What is the emf induced in the loop? Problem 1.
In Fig. 21-49, determine the direction of the induced cur- rent in resistor RA (a) when coil B is moved toward coil A, (b) when coil B is moved away from A, (c) when the resis- tance Rg is increased but the coils remain fixed. Explain your answers. Coil A Coil B FIGURE 21-49 RA RB Question 8.
In the figure below, a semicircular conductor of radius R = 0.280 m is rotated about the axis AC at a constant rate of 160 rev/min. A uniform magnetic field of magnitude 1.20 T fills the entire region below the axis and is directed out of the page. • Bou (a) Calculate the maximum value of the emf induced between the ends of the conductor. (b) What is the value of the average induced emf for each complete rotation? (c) How would your answers to parts (a) and (b) change if the magnetic field were allowed to extend a distance R above the axis of rotation? (Select all that apply.) O The value in part (a) would increase. O The value in part (a) would remain the same. O The value in part (a) would decrease. O The value in part (b) would increase. O The value in part (b) would remain the same. O The value in part (b) would decrease. (d) Sketch the emf versus time when the field is as drawn in the figure. Choose File No file chosen This answer has not been graded yet. (e) Sketch the emf versus…
•14 o In Fig. 30-42a, a uniform magnetic field B increases in magnitude with time t as given by Fig. 30-42b, where the vertical axis scale is set by B, = 9.0 mT and the horizontal scale is set by , = 3.0 s. A circular conducting loop of area 8.0 x 10-4 m² lies in the field, in the plane of the page. The amount of charge q passing point A on the loop is given in Fig. 30-42c as a function of t, with the vertical axis scale set by q, = 6.0 mC and the horizontal axis scale again set by t, = 3.0 s. What is the loop's resistance? B. 4. t (s) t (s) (a) (b) (c) B(mT) (ou) b
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A solenoid of length 55 cm has 280 turns of radius 2.4 cm. An outer coil with 14 turns of radius 5.2 cm is placed around the solenoid. The axes of the coil and solenoid coincide. Find the magnitude of the emf induced in the coil if the current in the solenoid varies according to I= 6sin (60πt) A. cos (60nt) mV outer coil solenoid
•11 A rectangular coil of N turns and of length a and width b is rotated at frequency f in a uniform magnetic field B, as indicated in Fig. 30-42. The coil is connected to co-rotating cylinders, against which metal brushes slide to make contact. (a) Show that the emf induced in the coil is given (as a function of time t) by 8 = 2mfNabB sin(2mft) = Eg sin(2ft). This is the principle of the commercial alternating-current generator. (b) What value of Nab gives an emf with E 150 V when the loop is rotated at 60.0 rev/s in a uniform mag- %3D !3D netic field of 0.500 T? Sliding contacts XX X X x X a Fig. 30-42 Problem 11.
Q8: Faraday's Law KEY IDEAS The long solenoid S shown (in cross section) in Fig. 30-3 has 220 turns/cm and carries a current i = 1.5 A; its diameter D is 3.2 cm. At its center we place a 130-turn closely packed coil C of diameter d 2.1 cm. The current in the solehoid is reduced to zero at a steady rate in 25 ms. What is the magni- tude of the emf that is induced in coil C while the current in the solenoid is changing? 1. Because it is located in the interior of the solenoid, coil C lies within the magnetic field produced by current i in the solenoid; thus, there is a magnetic flux d, through coil C. 2. Because current i decreases, flux also decreases. 3. As d decreases, emf E is induced in coil C. 4. The flux through each turn of coil C depends on the area A and orientation of that turn in the solenoid's magnetic field B.Because B is uniform and directed perpendicular to area A, the flux is given by Eq. 30-2 (4 = BA). 5. The magnitude B of the magnetic field in the interior of a…