College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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In studies of the possibility of migrating birds using the Earth's magnetic field for navigation, birds have been fitted with coils as "caps" and "collars" as shown in the figure below.

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(a) If the identical coils have radii of 1.14 cm and are 2.11 cm apart, with 59 turns of wire apiece, what current should they both carry to produce a magnetic field of \(4.70 \times 10^{-5}\) T halfway between them?  
\[\_\_\_\_] \, \text{mA} 

(b) If the resistance of each coil is 235 \(\Omega\), what voltage should the battery supplying each coil have?  
\[\_\_\_\_] \, \text{V} 

(c) What power is delivered to each coil?  
\[\_\_\_\_] \, \text{mW} 

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Explanation of Diagram:  
The diagram depicts a bird swimming in water with two coils—one around its head as a "cap" and another around its neck as a "collar." These coils are used in scientific research to explore how birds might use the Earth's magnetic field for navigation during migration.
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Transcribed Image Text:In studies of the possibility of migrating birds using the Earth's magnetic field for navigation, birds have been fitted with coils as "caps" and "collars" as shown in the figure below. --- (a) If the identical coils have radii of 1.14 cm and are 2.11 cm apart, with 59 turns of wire apiece, what current should they both carry to produce a magnetic field of \(4.70 \times 10^{-5}\) T halfway between them? \[\_\_\_\_] \, \text{mA} (b) If the resistance of each coil is 235 \(\Omega\), what voltage should the battery supplying each coil have? \[\_\_\_\_] \, \text{V} (c) What power is delivered to each coil? \[\_\_\_\_] \, \text{mW} --- Explanation of Diagram: The diagram depicts a bird swimming in water with two coils—one around its head as a "cap" and another around its neck as a "collar." These coils are used in scientific research to explore how birds might use the Earth's magnetic field for navigation during migration.
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