Questions

If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vectors, the angle between these vectors is:

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a

1800

b

00

c

900

d

450

detailed solution

Correct option is C

|A→ +B→| = |A→ −B→| = θ = 900(A)2+(B)2+2(A)(B)cosθ = (A)2+(B)2-2(A)(B) cosθ2cosθ = 0 ⇒θ = 900

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