Question

The resultant of two forces, one double the other in magnitude, is perpendicular to the smaller of the two forces. The angle between the two forces is

• A. 60$^\circ$
• B. 120$^\circ$
• C. 150$^\circ$
• D. 90$^\circ$

Answer 1

Answer: (B)

120$^\circ$

Answer 2

Sin $\theta = \frac{P}{2P} = \frac{1}{2}$ i.e. $\theta$ = 30$^\circ$ Total angle = 90$^\circ$ + 30$^\circ$ = 120$^\circ$