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Q.

The resultant of two vectors 3P and 2P is R. If the first vector is doubled, then the resultant is also doubled. The angle between the two vectors is

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a

600

b

1200

c

900

d

1800

answer is B.

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Detailed Solution

Resultant,  R=9P2+4P2+12P2cosθ       …(i)                  2R=36P2+4P2+24P2cosθ     …(ii)Equating Eqs. (i) and (ii), we getcosθ=-12∴  θ=120°
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