The locus of the centres of the circles which touch externally the circles \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}\]and \[{{x}^{2}}+{{y}^{2}}=4ax\], will be

\[12{{x}^{2}}+4{{y}^{2}}-24ax+9{{a}^{2}}=0\]

\[12{{x}^{2}}-4{{y}^{2}}-24ax+9{{a}^{2}}=0\]

\[12{{x}^{2}}-4{{y}^{2}}+24ax+9{{a}^{2}}=0\]

\[12{{x}^{2}}+4{{y}^{2}}+24ax+9{{a}^{2}}=0\]

The locus of the centres of the circles which touch externally the cir

1.	The locus of the centres of the circles which touch externally the circles \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}\]and \[{{x}^{2}}+{{y}^{2}}=4ax\], will be
A.	\[12{{x}^{2}}-4{{y}^{2}}-24ax+9{{a}^{2}}=0\]
B.	\[12{{x}^{2}}+4{{y}^{2}}-24ax+9{{a}^{2}}=0\]
C.	\[12{{x}^{2}}-4{{y}^{2}}+24ax+9{{a}^{2}}=0\]
D.	\[12{{x}^{2}}+4{{y}^{2}}+24ax+9{{a}^{2}}=0\]
Answer» B. \[12{{x}^{2}}+4{{y}^{2}}-24ax+9{{a}^{2}}=0\]

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The locus of the centres of the circles which touch externally the circles \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}\]and \[{{x}^{2}}+{{y}^{2}}=4ax\], will be

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