Question

12. Three forces of equal magnitudes and making an angle of 120° with each other act on a body. Then that the resultant force is (A) Zero (B) 10N (C) 20N (D) 30N​

Answer 1

Answer:

Explanation:

120  

∘

 equilateral triangle

The concurrent forces always passing through a common point.  

According to Lami's theorem ,  

sina

C

​

=  

sinb

B

​

=  

sinc

A

​

 

As the magnitude of forces are same so: A=B=C

Thus, a=b=c

Also, a+b+c=360  

o

 or a=b=c=360/3=120  

o

 

As all forces same magnitude and same angle between them so it will make equilateral triangle.  

solution