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The locus of the point (l,m) if the line...

The locus of the point (l,m) if the line lx+my=1 touches the circles `x^(2)+y^(2)=a^(2)` is

A

`x^(2)+y^(2)=2a^(2)`

B

`2x^(2)+2y^(2)=a^(2)`

C

`a^(2)(x^(2)+y^(2))=1`

D

`a^(2)(x^(2)+y^(2))=2`

Text Solution

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The correct Answer is:
C
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