A 50 g horizontal metal bar, 15-cm-long, is free to slide up and down between two tall, vertical metal rods that are 15 cm apart. A 5.5×10-2 T magnetic field is directed perpendicular to the plane of the rods. The bar is raised to near the top of the rods, and a 1.2 resistor is connected across the two rods at the top. Then the bar is dropped. Part A What is the terminal speed at which the bar falls? Assume the bar remains horizontal and in contact with the rods at all times. Express your answer in meters per second. 跖 ΑΣΦ ? v = Submit Request Answer m/s
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- In a physics laboratory experiment, a coil with 250 turns enclosing an area of 12.9 cm² is rotated during the time interval 4.80×10-² s from a position in which its plane is perpendicular to Earth's magnetic field to one in which its plane is parallel to the field. The magnitude of Earth's magnetic field at the lab location is 5.40x10-5 T. Part A What is the magnitude of the magnetic flux (initial) through the coil before it is rotated? Express your answer numerically, in webers, to at least three significant figures. ► View Available Hint(s) ΟΙ ΑΣΦ |Pinitial | = Submit Part B |Pfinal Submit What is the magnitude of the magnetic flux final through the coil after it is rotated? Express your answer numerically, in webers, to at least three significant figures. ► View Available Hint(s) VG ΑΣΦ = = w ? Wb ? Wb Review | ConstantsA coil has 180 turns enclosing an area of 10.4 cm². In a physics laboratory experiment, the coil is rotated during the time interval 0.046 s from a position in which the plane of each turn is perpendicular to Earth's magnetic field to one in which the plane of each turn is parallel to the field. The magnitude of Earth's magnetic field at the lab location is 5.00×10-5 T. Part A What is the magnitude of the magnetic flux through one turn of the coil before it is rotated? Express your answer in webers. View Available Hint(s) initial Submit Part B |final = = Submit —| ΑΣΦ = What is the magnitude of the magnetic flux through one turn of the coil after it is rotated? Express your answer in webers. ► View Available Hint(s) ΠΙ ΑΣΦ ? Wb ? WbPoint A in (Figure 1) is 6.0 mm from the wire. Assume that the wire is very long and that all other wires are too far away to contribute to the magnetic field. Figure ww 20 Ω 60 V + 100 Ω . A < 30 Ω 1 of 1 www Part A What is the magnetic field strength at point A? Express your answer with the appropriate units. BA= Submit 2² Provide Feedback μА Value Request Answer Units ?
- The magnetic field at the earth's surface can vary in response to solar activity. During one intense solar storm, the vertical component of the magnetic field changed by 2.8 μT per minute, causing voltage spikes in large loops of the power grid that knocked out power in parts of Canada. Part A What emf is induced in a square 180 km on a side by this rate of change of field? Express your answer with the appropriate units. E = Submit μA Value Provide Feedback Request Answer Units ? Review | Constants | Periodic Table Next >A conducting loop of side lengths d = 0.5 m and resistance R = 2.50 is r = 0.25 m next to a long current carrying wire with Iwire = 10 A. The current in the wire, in the direction shown, is reduced to zero in 10 sections at a constant rate. a. b. What is the direction of the induced current induced in the loop? Explain how you determined this. What direction is the total magnetic force in? Explain how you determined this.The back emf in a motor is 31 V when operating at 1300 rpm . Part A What would be the back emf at 2400 rpm if the magnetic field is unchanged?
- A 7.0-cm -long wire is pulled along a U-shaped conducting rail in a perpendicular magnetic field. The total resistance of the wire and rail is 0.30 N. Pulling the wire with a force of 1.3 N causes 4.1 W of power to be dissipated in the circuit. Part A What is the speed of the wire when pulled with 1.3 N ? Express your answer in meters per second. Π ΑΣΦ V = Submit Part B What is the strength of the magnetic field? Express your answer in tesla. —| ΑΣΦ B = Request Answer Submit Request Answer ? ? m/s TA 550-turn solenoid is 12 cm long. The current in it is 38 A . A straight wire cuts through the center of the solenoid, along a 5.0-cm diameter. This wire carries a 23-A current downward (and is connected by other wires that don't concern us). Part A What is the force on this wire assuming the solenoid's field points due east?N batteries not shown A. A wire is connected to batteries (not shown), and current flows through the wire. The wire lies flat on a table, and you are looking down on it from above. The wire is laid on top of a compass, resting about 6 mm above the needle. The distance d is 5.5 cm. The compass needle deflects 11 degrees from North, as shown. At this location the horizontal component of the Earth's magnetic field is 2e-5 tesla. What is the direction of the magnetic field at location A, midway between the wires, due to the current in the wire? Out of the page What is the approximate magnitude of the magnetic field at location A, due to the current in the wire? |B| = 3.88e-6 × T What approximations or assumptions did you make in solving this problem? Assume one side of the wire is much longer than d Assume that at the location of the compass the effect of the distant wire is negligible Assume the Earth's magnetic field is negligible Assume the bent end of the wire is far from location A
- A 10 cm x 10 cm square is bent at a 90° angle. A uniform 5.70x10-2 T magnetic field points downward at a 45° angle.(Figure 1) You may want to review (Pages 843-845). For help with math skills, you may want to review: The Vector Dot Product Figure 45% 5 cm 18 B 1 1 of 1 5 cm 10 cm Part A What is the magnetic flux through the loop? Express your answer with the appropriate units. Value Submit HÅ Provide Feedback Units Request Answer □】?A circular coil of wire 9.00 cm in diameter has 14.0 turns and carries a current of 2.70 A. The coil is in a region where the magnetic field is 0.570 T. For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Torque on a circular coil. Part A What orientation of the coil gives the maximum torque on the coil ? Express your answer as an angle in degrees between the field and the normal to the plane of the loop. o= Submit Part B Tmax = What is this maximum torque in part (A) ? Express your answer in newton-meters. Submit Part C ΑΣΦ Request Answer ز Submit ΑΣΦ Request Answer For what orientation of the coil is the magnitude of the torque 71.0 % of the maximum found in part (B)? Express your answer as an angle in degrees between the field and the normal to the plane of the loop. ? - ΑΣΦ Request Answer N m ?In a physics laboratory experiment, a coil with 210 turns enclosing an area of 11.7 cm² is rotated during the time interval 5.00×10-² s from a position in which its plane is perpendicular to Earth's magnetic field to one in which its plane is parallel to the field. The magnitude of Earth's magnetic field at the lab location is 6.60×10-5 T. Part A What is the magnitude of the magnetic flux (initial) through the coil before it is rotated? Express your answer numerically, in webers, to at least three significant figures. ▸ View Available Hint(s) Pinitial Submit 10 xa Xb B T ΑΣΦ X.10⁰ 1.62 107 Previous Answers √x vx X x pond |X| ? Wb X Incorrect; Try Again; 9 attempts remaining The number of turns is not included in the definition of magnetic flux.