Question

Q.4 Two forces of magnitude Aand B are
acting at right angle to each other. The
magnitude of their resultant is
​

Answer 1

AnSweR :

• Magnitude of resultant force will be 0.

As we know triangle law of vector addition :

F_eq = √[(F1)² + (F2)² + F1F2cos Ø]

As A and B are acting along right angles. It means Ø = 90°

And Cos 90° = 0

So,

F_eq = 0

Answer 2

Answer:

Explanation:

when two forces[vectors] act perpendicularly, the angle between the two vectors [here, vector is force] is 90 deg.

according to the equation of triangle law or parallelogram law of vector addition; resultant =$\sqrt({force 1)^{2} + (force 2)^{2} + 2. force 1. force 2cos 90 }$

                              =$\sqrt{(force1)^{2} + (force2)^{2} }$ [ cos 90 = 0

                                                                           so, 2.force1.force2cos90=0]