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Sources of Magnetic Fields
  
 
Problems
Problem 2.1:
A wire carrying a current I runs from the origin to the point (0, d ), shown below. What is the strength of the magnetic field at the point (r, 0)?
What is the magnetic field strength at point P?
[Solution]
Problem 2.2:
What is the magnitude and direction of the magnetic field at the center of a square wire with sides of length d and current I?
[Solution]
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