One of the two small circular coils (neither | vedclass

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Question

(C) When two parallel circular coils carry current in the same direction,they attract each other. Since they are in series,the current $I$ is the same

Vedclass · Accepted Answer

Force is proportional to $d^{-1}$.

Vedclass · Answer

(C) When two parallel circular coils carry current in the same direction,they attract each other. Since they are in series,the current $I$ is the same in both. The magnetic field $B$ produced by one coil at a distance $d$ is proportional to $I/d^3$ for a dipole,but for the force between two current loops,the interaction force $F$ between two magnetic dipoles separated by distance $d$ is proportional to $d^{-4}$. However,considering the interaction of current elements,the force between two parallel current-carrying loops is proportional to $d^{-2}$ in the near field approximation. The statement that the force is proportional to $d^{-1}$ is incorrect.

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