Two charges each of $1\;coulomb$ are at a distance $1\,km$ apart, the force between them is

  • A

    $9 \times {10^3}\;Newton$

  • B

    $9 \times {10^{ - 3}}\;Newton$

  • C

    $1.1 \times {10^{ - 4}}\;Newton$

  • D

    ${10^4}\;Newton$

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The magnitude of electric force on $2\, \mu \,C$ charge placed at the centre $O$ of two  equilateral triangles each of side $10 \,cm$, as shown in figure is $P$. If charge $A, B, C, D, E$ and $F$ are $2\, \mu \,C, 2\, \mu \,C, 2\, \mu \,C,-2\, \mu \,C, -2\, \mu \,C, -2\, \mu \,C$   respectively, then $P$ is :.....$N$