Q. If three coplanar, concurrent forces are acting at a point are in equilibrium, of which two of them are collinear, then what is the magnitude of third force which is acting at an angle B with other two forces?

A
zero
B
algebraic sum of other two forces
C
vector sum of other two forces
D
none of the above
Solution:

The ?vector sum? of any two of any forces in coplanar system will have ?magnitude? equal to the third force. Because at equilibrium the vector sum of all vectors involved is zero.

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