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Q.

The resultant of two forces, one double the other in magnitude is perpendicular to smaller of two forces.  The angle between two forces is

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a

150°

b

60°

c

120°

d

90°

answer is D.

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Detailed Solution

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Let  A→ is smaller

sinα=AB=12=30°

Angle between A→ and B→ is 120°

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The resultant of two forces, one double the other in magnitude is perpendicular to smaller of two forces.  The angle between two forces is