Question

If two numerical equal forces P and P acting at a point produce a resultant force of magnitude P itself, then the angle between the two original forces is :-
A. `0^(@)`
B. `60^(@)`
C. `90^(@)`
D. `120^(@)`

Answer 1

Correct Answer - D
We have `P^(2)=P^(2)+P^(2)+2P^(2) cos q`
`rArr " " cos theta =-(1)/(2)`
`theta=120^(@)`