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3.1 vectors — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics3.1 vectors1 Mark
MCQ
Three concurrent forces of the same magnitude are in equilibrium. What is the angle between the forces  Also name the triangle formed by the forces as sides
  • ✓
    $120^°$ equilateral triangle
  • B
    $60^°$ equilateral triangle
  • C
    $120^°, 30^°, 30^° $ an isosceles triangle
  • D
    $120^°$ an obtuse angled triangle
✓

Answer

Correct option: A.
$120^°$ equilateral triangle
a
(a) In $N$ forces of equal magnitude works on a single point and their resultant is zero then angle between any two forces is given

$\theta = \frac{{360}}{N}$$ = \frac{{360}}{3} = 120^\circ $

If these three vectors are represented by three sides of triangle then they form equilateral triangle

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