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Author Question: A high power line carries a current of 1.0 kA. What is the strength of the magnetic field this line ... (Read 89 times)

ts19998

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on: Jul 29, 2018
A high power line carries a current of 1.0 kA. What is the strength of the magnetic field this line produces at the ground, 10 m away? (0 = 4  10-7 T  m/A)
 
  A) 4.7 T B) 20 T C) 6.4 T D) 56 T

Question 2

The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is 28 years. Suppose that samples of cobalt-60 and strontium-90 are such that they initially have the same activity (number of decays per second).
 
  What is true about the initial numbers of cobalt-60 and strontium-90 nuclei in these samples?
  A) There are more strontium-90 than cobalt-60 nuclei.
  B) There are equal numbers of cobalt-60 and strontium-90 nuclei.
  C) It is not possible to compare numbers of nuclei without knowing the masses of the samples.
  D) There are more cobalt-60 than strontium-90 nuclei.
Physics ¦ Walker ¦ 5th Edition
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joechoochoy

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

B

Answer to Question 2

A


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