$A$ particle of mass $m$ is attached to four springs with spring constants $k, k, 2k$ and $2k$ as shown in the figure. Four springs are attached to the four corners of a square and a particle is placed at the center. If the particle is pushed slightly towards any side of the square and released, the period of oscillation will be

  • A
    $2 \pi \sqrt{\frac{m}{3k}}$
  • B
    $2 \pi \sqrt{\frac{m}{3 \sqrt{2}k}}$
  • C
    $2 \pi \sqrt{\frac{m}{6k}}$
  • D
    $2 \pi \sqrt{\frac{m}{2k}}$

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