InterviewSolution
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InterviewSolution
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The resultant of two vectors `vec(P)` and `vec(Q)` is `vec(R )`. If the magnitude of `vec(Q)` is doubled, the new resultant vector becomes perpendicular to `vec(P)`. Then, the magnitude of `vec(R )` is equal toA. `(P^(2)-Q^(2))/(2PQ)`B. `(P+Q)/(P-Q)`C. `Q`D. `P/Q` |
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Answer» Correct Answer - C `R^(2)=P^(2)+Q^(2)+2PQ cos theta` when `theta`is doubled `tan90=(2Q sin theta)/(P+2Q cos theta)` |
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