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The condition that the chord a x cos alp...

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