The two circles x^2 + y^2 = ax and x^2 + y^2 = c^2 (c > 0) touch each other if

JEE Main 2011 Mathematics question

The two circles and (c > 0) touch each other if

Answer: (1)

The first circle has centre and radius , and passes through the origin; the second has centre O and

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Question ID VK-039358