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A particle acted upon by forces ${\vec{F}}_{1}, {\vec{F}}_{2}$ and ${\vec{F}}_{3}$ is in equilibrium. Angle between ${\vec{F}}_{1}$ and ${\vec{F}}_{2}$ is 85⁰, angle between ${\vec{F}}_{1} and {\vec{F}}_{3}$ is 175⁰. Angle between ${\vec{F}}_{2} and {\vec{F}}_{3}$ is

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100°

120°

130°

Depends on magnitudes of the forces

answer is A.

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Detailed Solution

$θ = 360 - (175 + 85) = 360 - 260 = 100^{0}$

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