31. A single loop of wire of radius 0.23 m is placed in a 0.75 T magnetic field as shown. The magnetic field is changed to a strength of 0.50 T in the opposite direction in 0.61 s. хв A. B. X C. D. X X X X X 0.23 m Before X X X What is the average emf induced the coil? 0.068 V 0.094 V 0.34 V 0.47 V X 0.23 m After . B

31. A single loop of wire of radius 0.23 m is placed in a 0.75 T magnetic field as shown. The magnetic field is changed to a strength of 0.50 T in the opposite direction in 0.61 s. хв A. B. X C. D. X X X X X 0.23 m Before X X X What is the average emf induced the coil? 0.068 V 0.094 V 0.34 V 0.47 V X 0.23 m After . B

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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A rectangular coil with sides 0.120 m by 0.210 m has 495 turns of wire. It is rotated about its long axis in a uniform magnetic field of 0.590 T that is perpendicular to the long axis. At what frequency f, in complete cycles per second, must the coil be rotated for it to generate a maximum voltage of 115 V? f = Hz * TOOLS x10
10. A circular wire coil with 26 turns and radius 3.81 cm is placed in a uniform magnetic field of strength 7.91 T, directed perpendicular to the plane of the wire loops. Over a period of 1.72 s, the magnetic field fades away to zero. What is the average induced emf (voltage) in the coil over this period of time? 0.872 V 0.545 V 0.327 V 0.709 V
7 The loop in the figure has an induced current as shown. The loop has a resistance of 0.18 N. Is the magnetic field strength increasing or decreasing? What is the rate of change of the field, AB/At? 150 mA X X 8.0 cm x x x 8.0 cm
003 A circular coil of wire 7.8 cm in diameter has a resistance of 1.61 2. It is located in a magnetic field of 0.304 T directed at right angles to the plane of the coil. The coil is removed from the field in 0.169 s. What is the induced emf in the coil? As- sume the magnetic flux is reduced linearly. Answer in units of V. How much electric energy is lost in the process? Answer in units of J.
A circular loop with a radius of 2.5 m rests horizontally inside a uniform magnetic field of 0.9 T in a down direction. What is the induced emf when the magnetic field drops to zero in 0.75 s? O a. 9.40 V O b. 23.6 V O c. 34.2 V O d. 17.5 V
2. A segment of wire 7.9 cm long is moving at a velocity of 4.75 m/s toward a parallel (much longer) wire which carries a current of 3.83 A. At a particular instant the wire segment is 5.0 cm away from the long, current-carrying wire. What is the induced emf (voltage) between the two ends of the wire segment? 2.30E-06 V 4.03E-06 V 6.90E-06 V 5.75E-06 V
5. A jet airplane with a 75.0 m wingspan is flying at 280 m/s. What emf is induced between wing tips if the vertical component of the Earth's field is 3.00 x 10-5 T? 6. As shown in the figure, a wire and a 10-N resistor are used to form a circuit in the shape of a square with dimensions 20 cm by 20 cm. A uniform but non-steady magnetic field is directed into the plane of the circuit. The magnitude of the magnetic field is steadily decreased from 2.70 T to 0.90 T in a time interval of 96 ms. What is the induced current in the circuit, and what is its direction through the resistor? - 20 cm → 20 cm ww a 10 Ω X X X X X X
2. A circular loop consisting of a single turn of wire and a diameter of 15 cm lays flat at the edge of a table, as shown. A uniform magnetic field of 0.50 T passes perpendicularly through the table and nowhere else. If the loop is pulled horizontally straight off the table at a speed of 15 m/s, what is the average emf induced in the loop. In what direction does the resulting induced current flow? If the loop has a resistance of 10 , how much current is induced in the loop? Hint: this is NOT motional emf problem. [Answers: (a) & = 0.88 V, (b) ccw, (c) I = 0.088 A] 0 0
1.A circular coil (200 turn radius of 6.0 cm) is rotated in a uniform magnetic field (B = 3.6x10-4 T) At t = 0 the coil is perpendicular to the field and at t = 0.015s the coil is parallel to the field what is the average emf induced in the coil? 2.A square loop of wire with an area of 2.5x10-3 m2 is perpendicular to a uniform magnetic field (B = 2.2x10-2 T). If the square collapsed to an area of essentially 0 m2 in a time of 0.100 s as shown in the diagram what is the average induced emf as it is collapsed and what is the direction of the induced current? (Remember to use conventional current) X X X X хх
Q8.5 A circular plastic core is wrapped with a 22.0 m-long copper wire, with a diameter of 0.0200 mm and resistivity of 1.68×10-8 9-m, coiled 88 times, and its ends are linked to create a closed circuit. A magnetic field that increases at a constant rate of 12.0 mT/s, parallel to the coil's axis. Calculate the rate at which the wire produces thermal energy
A uniform magnetic field is applied paralle to the axis of a 60-turn circular coil with a radius of 6.0 cm and a resistance of 0.90 ̛. If the magnetic field increases uniformly from 0.20 T to 1.8 T in 0.20 s, what is the magnitude of the emf induced in the coil? A) 16 V B) 12 V C) 9.2 V D) 7.2 V E) 5.4 V
6. The conducting rod shown in the accompanying figure moves along parallel metal rails that are 25-cm apart. The system is in a uniform magnetic field of strength 0.75 T, which is directed into the page. The resistances of the rod and the rails are negligible. a. What is the emf (including its sense) induced in the rod when it is moving to the right with a speed of 5.0 m/s? b. What force is required to keep the rod moving at this speed? c. What is the rate at which work is done by this force? d. What is the power dissipated in the resistor? B x M x x t x 25 cm 5.0 m/s 0.25 N * N