Two long parallel wires carry currents of 10 A in opposite ...

[kshipps]

Two long parallel wires carry currents of 10 A in opposite directions. They are separated by 40 cm. What is the magnetic field in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other?
 
  A)
 
  1.5  10-6 T
  B)
 
  3.3  10-6 T
  C)
 
  6.7  10-6 T
  D)
 
  3.3  10-5 T
  E)
 
  6.7  10-5 T

Question 2

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the magnetic field midway between the two wires?
 
  A)
 
  1.0  10-5 T
  B)
 
  2.0  10-5 T
  C)
 
  3.0  10-5 T
  D)
 
  4.0  10-5 T
  E)
 
  5.0  10-5 T

[Cnarkel]

Answer to Question 1

C

Answer to Question 2

E

[kshipps]

Excellent

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