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

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In vector diagram shown in figure where \( (\vec{R}) \) is the
P
resultant of vectors \( (\vec{A}) \) and \( (\vec{B}) \).
W
If \( R=\frac{B}{\sqrt{2}} \), then value of angle \( \theta \) is :
(1) \( 30^{\circ} \)
(2) \( 45^{\circ} \)
(3) \( 60^{\circ} \)
(4) \( 75^{\circ} \)
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