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Multiple choice

The locus of the mid-point of the chord of length $2l$ of the circle $x^{2}+y^{2}=a^{2}$, will be

  1. $x^{2}+y^{2}=t^{2}+a^{2}$
  2. $x^{2}+y^{2}=a^{2}+l^{2}$
  3. $x^{2}+y^{2}=l^{2}-a^{2}$
  4. $x^{2}+y^{2}=a^{2}-l^{2}$
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