If the circles \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}\]and \[{{x}^{2}}+{{y}^{2}}-2gx+{{g}^{2}}-{{b}^{2}}=0\] touch each other externally, then

\[{{g}^{2}}={{a}^{2}}+{{b}^{2}}\]

If the circles \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}\]and \[{{x}^{2}}+{{y}^{

1.	If the circles \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}\]and \[{{x}^{2}}+{{y}^{2}}-2gx+{{g}^{2}}-{{b}^{2}}=0\] touch each other externally, then
A.	\[g=ab\]
B.	\[{{g}^{2}}={{a}^{2}}+{{b}^{2}}\]
C.	\[{{g}^{2}}=ab\]
D.	\[g=a+b\]
Answer» E.

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If the circles \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}\]and \[{{x}^{2}}+{{y}^{2}}-2gx+{{g}^{2}}-{{b}^{2}}=0\] touch each other externally, then

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