question_answer

The two circles \[{{x}^{2}}+{{y}^{2}}=ax\] and\[{{x}^{2}}+{{y}^{2}}={{c}^{2}}(c>0)\] touch each other, if   AIEEE  Solved  Paper-2011

A) \[\left| a \right|=2c\]                       

B) \[2\left| a \right|=c\]

C) \[\left| a \right|=c\]                         

D) \[a=2c\]

Correct Answer: C

Solution :

                                     The figure is self explanatory Clearly \[c=\left| a \right|\]