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Resultant of two vectors of magnitude `P` and `Q` is of magnitude `Q`.If the magnitude of `vecQ` is doubled now the angle made by new resultant with `vecP` isA. `30^(@)`B. `90^(@)`C. `60^(@)`D. `120^(@)` |
Answer» Correct Answer - B `Q^(2)=P^(2)+Q^(2)+2PQcos theta` , `costheta=-P/(2Q),Tan alpha=(2Q sin theta)/(P+2Q cos theta)` |
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