One of the two small circular coils, (none of them having any self- inductance) is suspended with a $V-$ shaped copper wire, with plane horizontal. The other coil is placed just below the first one with plane horizontal. Both the coils are connected in series with a $dc$ supply. The coils are found to attract each other with a force. Which one of the following statements is incorrect ?
JEE MAIN 2013, Diffcult
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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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