Net magnetic field at the centre of the circle $O$ due to a current carrying loop as shown in figure is $(\theta < 180^o)$
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Two long conductors, separated by a distance $d$ carry current $I_1$ and $I_2$ in the same direction. They exert a force $F$ on each other. Now the current in one of them is increased to two times and its directions is reversed. The distance is also increased to $3d$. The new value of the force between them is
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