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It has been seen that for two cables carrying currents I1 and 12. the force on the first cable due to the currents in the
second is given by the so-called circuital law of Ampere
dl x (dl, x R)
F = Ho
47
R3
Expand the triple vector product to show that the forces satisfy Newton's 3rd law
0 = F1 + F2
%3D

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