question_answer 47)

  Do magnetic forces obey Newton's third law. Verify for two current elements located at the origin and  located at (0, R, 0). Both carry current .

Answer:

                  Refer Pig. 3(EP).2, magnetic field due to current element  at a point on element ,   Force on  is, It can not be zero. Force on due to magnetic field by current  is zero as magnetic field of has no interaction with current element . Therefore magnetic forces on current elements in this case do not obey Newton's third law.