Do magnetic forces obey Newton’s third law.

Question:

Do magnetic forces obey Newton’s third law. Verify for two current elements

$d l_{1}=d l \hat{i} \quad$ located at the origin and

$d l_{2}=d l \hat{j} \quad$ located at $(0, \mathrm{R}, 0) .$ Both carry current $\mathrm{I}$.

Solution:

The magnetic forces do not obey Newton’s third law if there is no current flowing in the conductor which is placed parallel to each other.

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