A2L Item 180

Goal: Reason about magnetic fields

Source: 283 field of bar magnets

identical bar magnets are placed rigidly and parallel to each other as
shown. At what locations, if any, is the net magnetic field close to

  1. A only
  2. B only
  3. C only
  4. D only
  5. A and B
  6. A, B, and C
  7. C and D
  8. None of the above.



(3) C is the point of weakest field. The field is weak at A also.
Find out student reasons is more important than the answer. Have
students sketch the field lines. Ask them how is the strength of the
field indicated on a field line diagram.