A long straight wire carries a current into the board. Point P lies nearly above the wire. Which direction is the magnetic field at point P?
Answer: to the right
A long straight wire carries a current I into the board. There are two circles drawn on the board, both centered on the wire. One has a large radius, the other a small radius.
B dot dsaround the little circle is
Answer: b), the same (because both circle surround the same amount of current)
What is the value of the integral
B dot dsaround the little circle in problem 2?
Answer: mu-nought times I
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