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Physics · MOTION IN A PLANE
हिन्दीTwo vectors of equal magnitude \( F \) have a resultant of magnitude \( F \). The angle \( \theta \) between the two vectors is:
Correct answer · Option 1
120°
Explanation
Using \( R = \sqrt{A^2+B^2+2AB\cos\theta} \), \( F = \sqrt{F^2+F^2+2F^2\cos\theta} \implies F^2 = 2F^2(1+\cos\theta) \implies \cos\theta = -\frac{1}{2} \implies \theta = 120^\circ \).
