One of the two small circular coils (neither having any self-inductance) is suspended with a $V$-shaped copper wire,with its plane horizontal. The other coil is placed just below the first one with its plane horizontal. Both 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?
- ABoth the coils carry currents in the same direction.
- BCoils will attract each other,even if the supply is an $ac$ source.
- CForce is proportional to $d^{-1}$.
- DForce is proportional to $d^{-2}$.
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