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**If two vectors are equal in magnitude and their resultant is also equal in magnitude to one of them, then the angle between the two vectors is **

### Options

(a) 60°

(b) 120°

(c) 90°

(d) 0°

### Correct Answer:

120°

### Explanation:

The angle θ between the vector A and B

Using the cosine rule, R² = A²+B²-2AB cosθ

Where R=A=B, then

R² = R²+R²-2RR cosθ

cosθ = -1/2

θ = 120°.

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Topics: Motion in Plane
(93)

Subject: Physics
(2479)

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