The two circles

Question:

The two circles $x^{2}+y^{2}=a x$ and $x^{2}+y^{2}=c^{2}(c>0)$ touch each other if :-

  1. a = 2c

  2. $|\mathrm{a}|=2 \mathrm{c}$

  3. $|2| \mathrm{a} \mid=\mathrm{c}$

  4. $|\mathrm{a}|=\mathrm{c}$


Correct Option: , 4

Solution:

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