A The magnetic field in a region of space is given by
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Physics for Scientists and Engineers: Foundations and Connections
- Unreasonable results Frustrated by the small Hall voltage obtained in blood flow measurements, a medical physicist decides to increase the applied magnetic field strength to get a 0.500-V output for blood moving at 30.0 cm/s in a 1.50-cm-diameter vessel. (a) What magnetic field strength is needed? (b) What is unreasonable about this result? (C) Which premise is responsible?arrow_forward(a) A 200-turn circular loop of radius SO.0 cm is vertical, with its axis on an east-west line. A current of 100 A circulates clockwise in the loop when viewed from the east. Earth’s field here is due north, parallel to the ground, with a strength of 3.0105T. What are the direction and magnitude of the torque on the loop? (b) Does this device have any practical applications as a motor?arrow_forwardA coil with a self-inductance of 3.0 H and a resistance of 100 2 carries a steady current of 2.0 A. (a) What is the energy stored in the magnetic field of the coil? (b) What is the energy per second dissipated in the resistance of the coil?arrow_forward
- A current-carrying conductor PQ of mass m and length L is placed on an inclined plane with angle of inclination (Fig. P30.93). A uniform magnetic field B is directed upward as shown. Assume friction is negligible. a. Determine the magnitude and direction of the current in the conductor so that it remains in equilibrium. b. If the direction of the current is reversed, will the conductor still be in equilibrium? If not, find the magnitude of the initial acceleration of the conductor. FIGURE P30.93arrow_forwardA P A circular conducting disc or radius g is rotating around its axis with an angular velocity w rad/s and is exposed to a magnetic field B = B, sin(wt) that is parallel to its axis in the out-of-page direction. If we connect a voltmeter between points A (the center of the rotating disc) and P (on the edge of the rotating disc), what will be the measured voltage Vap?arrow_forwardA square, 44.0-turn coil that is 13.0 cm on a side with a resistance of 0.900 2 is placed between the poles of a large electromagnet. The electromagnet produces a constant, uniform magnetic field of 0.400 T directed into the screen. As suggested by the figure, the field drops sharply to zero at the edges of the magnet. The coil moves to the right at a constant velocity of 3.10 cm/s. N-turn coil B into the screen Varrow_forward
- When operated on a household 110.0 V line, typical hair dryers draw about 1450 W of power. The current can be modeled as a long, straight wire in the handle. During use, the current is about 2.45 cm from the user's hand. What is the current in the hair dryer? A What is the resistance of the hair dryer? Ω What magnetic field does the hair dryer produce at the user's hand? The permeability of free space is µo = 47 × 10-' N/A?. Tarrow_forwardA coil 30 cm in diameter consist of 20 turns of circular copper wire 2 mm in diameter. The coil is connected to a low resistance galvanometer. Initially coil is placed in a uniform magnetic field perpendicular to its plane. During the experiment the magnetic field changes from 0.5 T to 2.5 T in 0.4 s. Ignore the resistance of the connecting wires. a. Calculate the initial flux in the coil. (copper resistivity Ω·m) Round to two decimal places.TOPIC: Electromagnetic Inductionarrow_forwardIn the figure (Figure 1) the top wire is 1.2 mm -diameter copper wire and is suspended in air due to the two magnetic forces from the bottom two wires. The current flow through the two bottom wires is 79 A in each. Figure 1 of 1 N -3.8 cm -3.8 cm -3.8 cm Part A Calculate the required current flow in the suspended wire. Express your answer using two significant figures. —| ΑΣΦ ? Icu = Submit Provide Feedback Request Answer A Next >arrow_forward
- The magnetic field perpendicular to a single 17.2- cm -diameter circular loop of copper wire decreases uniformly from 0.750 T to zero. Part A If the wire is 2.75 mm in diameter, how much charge moves past a point in the coil during this operation? The resistivity of copper is 1.68 ×10−8Ω⋅m .arrow_forwardThe figure below shows an arrangement in which four long parallel wires carry equal currents directly into or out of the page at the corners of a square. Find the net force per unit of length on current i₁ if all currents are 1.5 A and a = : 20 cm. a i₁ i The x component, Fx/L = The y component, Fy/L = i₂ i3 Units uN/m Units uN/m ✓✓ Xarrow_forwardA the moving rod has a resistance of 0.25 Ω and moves on rails 20.0 cm apart. The stationary U-shaped conductor has negligible resistance. When a force of 0.410 N is applied to the rod, it moves to the right at a constant speed of 1.50 m/s. What is the magnetic field?arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningAn Introduction to Physical SciencePhysicsISBN:9781305079137Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar TorresPublisher:Cengage Learning