Two forces of magnitude F have a resultant of same magnitude F . angle between two forces is ..

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3-1.Vectors

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Two forces of magnitude $F$ have a resultant of the same magnitude $F$. The angle between the two forces is ........ $^o$

A$45$

B$120$

C$150$

D$60$

Solution

(b) $F = \sqrt {{{(F)}^2} + {{(F)}^2} + 2F.F\cos \theta } $
$⇒$ $\theta = 120^\circ $

Standard 11

Physics

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