1. The force on a wire carrying 8.75 A is a maximum of 1.28 N whenplaced between the pole faces of a magnet. If the pole faces are 5.4cm in diameter, what is the approximate strength of the magneticfield?2. A 60 W fluorescent bulb hasa resistance of about 12 Q when cold(30C) and 120 Q when on (hot). Estimate the temperature of thefilament when hot assuming an average temperature coefficient ofresistivitya = 0.0080(C°)¹.

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The force on a wire carrying 8.75 A is a maximum of 1.28 N when placed between the pole faces of a magnet. If the pole faces ar25.4 cm in diameter, what is the approximate strength of the magnetic field?

The force on a wire carrying 8.75 A is a maximum of 1.28 N when placed between the pole faces of a magnet. If the pole faces ar25.4 cm in diameter, what is the approximate strength of the magnetic field?

An Introduction to Physical Science

14th Edition

ISBN:9781305079137

Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres

Publisher:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres

Chapter8: Electricity And Magnetism

Section: Chapter Questions

Problem 16SA

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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

1. The force on a wire carrying 8.75 A is a maximum of 1.28 N when
placed between the pole faces of a magnet. If the pole faces are 5.4
cm in diameter, what is the approximate strength of the magnetic
field?
2. A 60 W fluorescent bulb hasa resistance of about 12 Q when cold
(30C) and 120 Q when on (hot). Estimate the temperature of the
filament when hot assuming an average temperature coefficient of
resistivity
a = 0.0080(C°)¹.

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