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Author Question: A certain metal wire has a cross-sectional area of 1.0 cm2 and a resistivity of 1.7 10-8 m. How ... (Read 56 times)

wenmo

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on: Jul 29, 2018
A certain metal wire has a cross-sectional area of 1.0 cm2 and a resistivity of 1.7  10-8   m. How long would it have to be to have a resistance of 1.0 ?
 
  A) 5.9  104 m B) 590 m C) 5.9 m D) 5.9 km E) 5.9  106 m

Question 2

A thin copper rod 1.0 m long has a mass of 0.050 kg and is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to balance the weight of the rod?
 
  A) 9.8 A B) 2.5 A C) 1.2 A D) 4.9 A


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owenfalvey

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Reply #1 on: Jul 29, 2018
Answer to Question 1

D

Answer to Question 2

D


wenmo

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Reply 2 on: Jul 29, 2018
Thanks for the timely response, appreciate it

jackie

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Reply 3 on: Yesterday
Wow, this really help

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