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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  • [NEET 2022]

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Two identical spheres each of radius $R$ are kept at center-to-center spacing $4R$ as shown in the figure. They are charged and the electrostatic force of interaction between them is first calculated assuming them point like charges at their centers and the force is also measured experimentally. The calculated and measured forces are denoted by $F_c$ and $F_m$ respectively.
($F_c$ and $F_m$ denote magnitude of force)