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Question 1
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The circles whose equations are $x^2+y^2+c^2=2ax$ and $x^2+y^2+x^2-2by=0$ will touch one another externally, if
A.
$\dfrac{1}{b^2}+\dfrac{1}{c^2}=\dfrac{1}{a^2}$
B.
$\dfrac{1}{c^2}+\dfrac{1}{a^2}=\dfrac{1}{b^2}$
C.
$\dfrac{1}{a^2}+\dfrac{1}{b^2}=\dfrac{1}{c^2}$
D.
None of these
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