In vector diagram shown in figure where \( (\vec{R}) \) is P the re...

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In vector diagram shown in figure where \( (\vec{R}) \) is
P the resultant of vectors \( (\vec{A}) \) and \( (\vec{B}) \).

W
If \( R=\frac{B}{\sqrt{2}} \), then value of angle \( \theta \) is:
(A) \( 30^{\circ} \)
(B) \( 45^{\circ} \)
(C) \( 60^{\circ} \)
(D) \( 75^{\circ} \)
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