3. a) Calculate the resistance per unit length of an iron wire, which has a radius of 1.5 mm. The resistivity of iron is 10 x 10-8 N. m. b) If the potential difference of 20 V is maintained across a 2.0-m length of the iron wire, what is the current in the wire?

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter28: Current And Resistance
Section: Chapter Questions
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3. a) Calculate the resistance per unit length of an iron wire, which has a radius of 1.5 mm. The
resistivity of iron is 10 x 10-8 N. m.
b) If the potential difference of 20 V is maintained across a 2.0-m length of the iron wire, what
is the current in the wire?
Transcribed Image Text:3. a) Calculate the resistance per unit length of an iron wire, which has a radius of 1.5 mm. The resistivity of iron is 10 x 10-8 N. m. b) If the potential difference of 20 V is maintained across a 2.0-m length of the iron wire, what is the current in the wire?
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