A loop of wire with a current is in uniform magnetic fields. In one situation the wire is halfway in the field. In another, the wire is between two magnets whose fields are pointing in opposite directions. Which of these will have a net force? Which would have a net torque? Which direction will each loop spin and/or move, assuming it starts at rest? Explain your reasoning for your answers.

A loop of wire with a current is in uniform magnetic fields. In one situation the wire is halfway in the field. In another, the wire is between two magnets whose fields are pointing in opposite directions. Which of these will have a net force? Which would have a net torque? Which direction will each loop spin and/or move, assuming it starts at rest? Explain your reasoning for your answers.

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter1: A Physics Toolkit

Section: Chapter Questions

Problem 2STP

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Concept explainers

Magnetic Field Of Coaxial Cable

The word coaxial means same axis. So for a long straight cable to be coaxial, it must have concentric cylindrical shaped conductor around it. Coaxial cable (popularly called ‘coax’) has various applications ranging from current conductors to radiofrequency signal transmitters. This cable has lower emission losses and provides protection from electromagnetic interference which allows signals with less power to transmit over longer distances.For example, currents produced in the pickup of a stereo turntable generally travel to the amplifier through a coaxial cable.The self-inductance of a coaxial cable is another important characteristic, because it influences the propagation of electrical signals in the cable.

Question

Which of these will have a net force?

Which would have a net torque?

Which direction will each loop spin and/or move, assuming it starts at rest?

Explain your reasoning for your answers.

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Step 1: Given that:

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Step 2: Calculation of net force on loop 1:

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Step 3: Calculation of net torque on loop 1:

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Step 4: Calculation of net force on loop 2:

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Step 5: Calculation of net torque on loop 2:

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Step 6: Conclusion of motion for loop 1:

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