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Two identical blocks are kept on a frictionless horizontal table connected by a spring of stiffness K and of original length $\ell_0$ A total charge Q is distributed on the block such that maximum elongation of sparing at equilibrium is equal to x value of q is:

• A
  $2\ell_0\sqrt{4\pi\in_0(\ell_0+\text{x})}$
• B
  $2\text{x}\sqrt{4\pi\in_0\text{k}(\ell_0+\text{x})}$
• C
  $2(\ell_0+\text{x})\sqrt{4\pi\in_0\text{kx}}$
• D
  $(\ell_0+\text{x})\sqrt{4\pi\in_0\text{kx}}$