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Question

A current is passed through a straight wire. The magnetic field established around it has its lines of forces :
  1. circular
  2. elliptical
  3. parabolic
  4. no fixed shape

A
circular
B
parabolic
C
elliptical
D
no fixed shape
Solution
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The magnetic field lines forms concentric circles around a current carrying wire as shown in the figure.
580406_286039_ans_f1c3411520bc4566b7557a50f4d9c77d.jpg

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