Two forces `P` and `Q` act at an angle of `120^(@)` with each other. If the resultant is at right angles to `P` and `P` is equal

Two forces `P` and `Q` act at an angle of `120^(@)` with each other. If the resultant is at right angles to `P` and `P` is equal to `4kg-wt`, then the value of `Q` is
A. `4 kg wt.`
B. `8 kg wt.`
C. `6 kg wt.`
D. `3 kg wt.`

Two forces `P` and `Q` act at an angle of `120^(@)` with each other. If the resultant is at right angles to `P` and `P` is equal to `4kg-wt`, then the

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