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If the two circles x^(2) + y^(2) + ax =...

If the two circles ` x^(2) + y^(2) + ax = 0 " and " x^(2) + y^(2) = c^(2)` , where ` a, c gt 0 ` , touch each other intenally , then :

A

2 |a| = c

B

|a| = c

C

a = 2c

D

|a | = 2c

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The correct Answer is:
B
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