There are two force vectors, one of $5\, N$ and other of $12\, N $ at what angle the two vectors be added to get resultant vector of $17\, N, 7\, N $ and $13 \,N$ respectively

  • A

    $0^o, 180^o$ and $90^o$

  • B

    $0^o, 90^o$ and $180^o$

  • C

    $0^o, 90^o $ and $90^o$

  • D

    $180^o, 0^o$ and $90^o$

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  • [NEET 2016]

Two equal forces ($P$ each) act at a point inclined to each other at an angle of $120^°$. The magnitude of their resultant is