Electric field strength due to a point charge of $5\,\mu C$ at a distance of $80\, cm$ from the charge is

  • A

    $8 \times {10^4}\,N/C$

  • B

    $7 \times {10^4}\,N/C$

  • C

    $5 \times {10^4}\,N/C$

  • D

    $4 \times {10^4}\,N/C$

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A point charge of $10\,\mu C$ is placed at the origin. At what location on the $X$-axis should a point charge of $40\,\mu\,C$ be placed so that the net electric field is zero at $x =2\,cm$ on the $X$-axis ?

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