A) Both the same carry currents in the same direction
B) Coils will attract each other, even if the supply is as source.
C) Force is proportional to \[{{\operatorname{d}}^{-4}}\], d = distance between the centres of the coils.
D) Force is proportional to \[{{\operatorname{d}}^{-2}}\]
Correct Answer: D
Solution :
As the force between the two coils is attractive hence currents in the coil must be in the same direction and the force,\[F\propto \frac{{{I}_{1}}{{I}_{2}}}{2\pi d}\]where \[{{I}_{1}}\]and \[{{I}_{2}}\]are the currents flowing through the coils.
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