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Q.

Two vectors of same magnitude act at a point. Twice the product of the magnitudes of two vectors is equal to the square of the magnitude of their resultant. The angle between the two vectors is

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a

90°

b

60°

c

30°

d

120°

answer is C.

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Detailed Solution

Let the magnitude of the vector be A.

The magnitude of resultant is R=A2+A2+2A2cosθ

2A2=R2=2A2+2A2cosθ

cosθ=0⇒θ=90o

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