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According to parallelogram law of vector...

According to parallelogram law of vector addition, the resultant is given by :

A

`sqrt(P^(2) +Q^(2) +2PQcos theta)`

B

`sqrt(P^(2) +Q^(2) - 2PQ cos theta)`

C

`sqrt((P^(2))/(Q^(2)))`

D

`sqrt(P^(2) cos^(2) theta +Q^(2) sin ^(2) theta)`

Text Solution

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The correct Answer is:
A
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