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The two circles x^2+y^2=ax and x^2+y^2=c...

The two circles `x^2+y^2=ax` and `x^2+y^2=c^2 (cgt0)` touch each other if

A

`|a|=c`

B

a = 2c

C

`|a|=2c`

D

`2|a|=c`

Text Solution

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The correct Answer is:
A
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