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Author Question: Two long, parallel wires carry currents of 20.0 A and 10.0 A in opposite directions (Fig. OQ30.9). ... (Read 63 times)

dmcintosh

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on: Jul 28, 2018
Two long, parallel wires carry currents of 20.0 A and 10.0 A in opposite directions (Fig. OQ30.9). Which of the following statements is true? More than one statement may be correct.
 
  1.In region I, the magnetic field is into the page and is never zero.
  2.In region II, the field is into the page and can be zero.
  3.In region III, it is possible for the field to be zero.
  4.In region I, the magnetic field is out of the page and is never zero.
  5.There are no points where the field is zero.

Question 2

How long does it take for the Moon to go from new phase to first-quarter phase?


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Bigfoot1984

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Reply #1 on: Jul 28, 2018
Answer to Question 1

3,4

Answer to Question 2

About 7 3/8 days


dmcintosh

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Reply 2 on: Jul 28, 2018
Gracias!

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Reply 3 on: Yesterday
Wow, this really help

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