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The resultant of two vectors vec(P) and ...

The resultant of two vectors `vec(P)` and `vec(Q)` is `vec(R)`. If `vec(Q)` is doubled then the new resultant vector is perpendicular to `vec(P)`. Then magnitude of `vec(R)` is :-

A

`((P^(2) - Q^(2))/(2PQ))`

B

Q

C

`(P)/(Q)`

D

`(P+Q)/(P-Q)`

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The correct Answer is:
B
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