Answered: As the bar in Figure CQ20.5 moves…

As the bar in Figure CQ20.5 moves perpendicular to the field, is an external force required to keep it moving with constant speed?

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter22: Magnetism

Section: Chapter Questions

Problem 35PE: (a) A DC power line for a light-rail system carries 1000 A at an angle of 30.0° to the Earth’s...

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Concept explainers

Bar Magnet

In physics, magnetism is a phenomenon exhibited by a magnetic substance that exerts either attractive or repulsive force. A bar magnet is either a rectangular or round and hollow fit comprised of ferromagnetic materials and has a fanciful attractive field surrounded by it.

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As the bar in Figure CQ20.5 moves perpendicular to the field, is an external force required to keep it moving with constant speed?

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(a) A physicist performing a sensitive measurement wants to limit the magnetic force on a moving charge in her equipment to less than 1.001012N. What is the greatest the charge can be if it moves at a maximum speed of 30.0 m/s in Earth's field? (b) Discuss whether it would be difficult to limit the charge to less than the value found in (a) by comparing it with typical static electricity' and noting that static is often absent,
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