The condition that the chord x cos alph...

The condition that the chord ` x cos alpha + y sin alpha - p = 0 " of " x ^(2) + y^(2) - a^(2) = 0 ` may subtend a right angle at the center of the circle is

A

`a^(2) = 2p^(2)`

B

`p^(2) =2a^(2)`

C

`a=2p`

D

p=2a

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The correct Answer is:

A

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