A The magnetic field in a region of space is given by
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Chapter 32 Solutions
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 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_forward
- A 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_forwardWhen operated on a household 110.0 V line, typical hair dryers draw about 1650 W of power. The current can be modeled as a long, straight wire in the handle. During use, the current is about 2.15 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 ?0=4?×10−7 N/A2.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
- A 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_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_forwardThe 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_forward
- You have a circular loop of wire in the plane of the page with an initial radius of 0.50 m which expands to a radius of 1.00 m . It sits in a constant magnetic field B = 38 mT pointing into the page. Assume the transformation occurs over 1.0 second and no part of the wire exits the field. Also assume an internal resistance of 30 Ω . What average current is produced within the loop and in which direction?arrow_forwardC pleasearrow_forwardThe solenoid shown in the diagram has 5 loops per centimeter and a cross sectional area of 0.3 m². The resistor has the resistance of 2 Ohm. When the switch is closed, the current in the solenoid increases at the rate of 200 A/s. Find the current through the resistor. Rarrow_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