18. I| A wire with a resistance of 3.2 N is bent into the two-loop shape shown in Figure P25.18. The length of the sides of the large square is 9.0 cm; those of the smaller square are half that. If the mag- netic field shown is increasing at a rate of 0.075 T/s, what is the current in the wire, FIGURE P25.18 and in which direction does it flow in the larger loop?

18. I| A wire with a resistance of 3.2 N is bent into the two-loop shape shown in Figure P25.18. The length of the sides of the large square is 9.0 cm; those of the smaller square are half that. If the mag- netic field shown is increasing at a rate of 0.075 T/s, what is the current in the wire, FIGURE P25.18 and in which direction does it flow in the larger loop?

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter17: Current And Resistance

Section: Chapter Questions

Problem 22P: The human body can exhibit a wide range of resistances to current depending on the path of the...

See similar textbooks

Similar questions

(a) What is the maximum torque on a 150-tum square loop of wire 13.0 cm oil a side that carries a 50.0-A current in a 1.60-T field? (b) Wliat is the torque when d is 10.9s?
An AC appliance cord has its hot and neutral wires separated by 3.00 mm and carries a 5.00-A current. (a) What is the average force per meter between the wires in the cord?(b) What is the maximum force per meter between the wires? (c) Are the forces attractive or repulsive? (d) Do appliance cords need any special design features to compensate forthese forces?
A conducting rod of length ℓ moves on two horizontal, frictionless rails as shown inFigure P31.26. If a constant force of 1.00 N moves the bar at 2.00 m/s through amagnetic field B that is directed into the page (a) what is the current through the 8.00-Ω resistor R? (b) What is the rate at which energy is delivered to the resistor? (c) Whatis the mechanical power delivered by the force Fapp?
(I) A long thin iron-core solenoid has 380 loops of wire permeter, and a 350-mA current flows through the wire. If thepermeability of the iron is 3000µ0 what is the total field Binside the solenoid?
Suppose that the current density carried by an infinite cylindrical wire is not uniform but in fact varies as Jz(u) = J0 * [1 - (u2 / R2)], where J0 is the value of the current density at the wire's center, R is the radius of the wire, and u is distance from the axis of the wire. Assuming that the magnetic field is circular, compute the wire's magnetic field both inside and outside the wire. (Ampere's law makes even nonuniform current densities manageable.) (Hint: The answer is BФ = 0.25 * μ0 * J0 * R on surface at u = R.)
You want to build a giant solenoid of one layer of tightly-wrapped 12-gauge copper wire (diameter is 0.2032 mm). It is to be 3.5 meters tall and square in shape with 0.75-m long sides. In order to achieve a 150-mT field inside of the solenoid how much current will it need to draw?
What is the energy density at the center of a circular loop of wire carrying a 29.0 A current if the radius of the loop is 22.0cm ?
A large cyclotron directs a beam of He ++ nuclei onto a target with a beam current of 0.250 mA. (a) How many He++ nuclei per second is this? (b) How long does it take for 1.00 C to strike the target? (c) How long before 1.00 mol of He++ nuclei strike the target?
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?
A 2.50-m-diameter university communications satellite dish receives TV signals that have a maximum electric field strength (for one channel) of 7.50 (V/m. (See Figure 24.28.) (a) What is the intensity of this wave? (b) What is the power received by the antenna? (c) If the orbiting satellite broadcasts uniformly over an area of 1.501013m2 (a large fraction of North America), how much power does it radiate? Figure 24.28 Satellite dishes receive TV signals sent from orbit. Although the signals are quite weak, the receiver can detect them by being tuned to resonate at their frequency.
The human body can exhibit a wide range of resistances to current depending on the path of the current, contact area, and sweatiness of the skin. Suppose the resistance across the chest from the left hand to the right hand is 1.0 106 . (a) How much voltage is required to cause possible heart fibrillation in a man, which corresponds to 500 mA of direct current? (b) Why should rubber-soled shoes and rubber gloves be worn when working around electricity?
A motor in normal operation carries a direct current of 0.850 A when connected to a 120-V power supply. The resistance of the motor windings is 11.8 . While in normal operation, (a) what is the back emf generated by the motor? (b) At what rate is internal energy produced in the windings? (c) What If? Suppose a malfunction slops the motor shaft from rotating. At what rate will internal energy be produced in the windings in this case? (Most motors have a thermal switch that will turn off the motor to prevent overheating when this stalling occurs.)