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13 July, 16:50

A magnetic field line must

a. go on forever.

b. form a closed loop.

c. have a north and south pole.

d. be created by a permanent magnet.

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Answers (2)
  1. 13 July, 17:51
    0
    B form a closed loop I think
  2. 13 July, 19:13
    0
    B. Form a closed loop.
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