jee-advanced 2000 Q27

jee-advanced · India · screening Vectors: Cross Product & Distances

27. Let the vectors $a , b , c$ and $d$ be such that $( a \times b ) \times ( c \times d ) = 0$. Let P1 and P2be planes determined by the pairs of vectors $a , b$ and $c , d$ respectively, then the angle between $P 1$ and P 2 is :
(A) 0
(B) $\mathrm { p } / 4$
(C) $\mathrm { p } / 3$
(D) $\mathrm { p } / 2$

27. Let the vectors $a , b , c$ and $d$ be such that $( a \times b ) \times ( c \times d ) = 0$. Let P1 and P2be planes determined by the pairs of vectors $a , b$ and $c , d$ respectively, then the angle between $P 1$ and P 2 is :\\
(A) 0\\
(B) $\mathrm { p } / 4$\\
(C) $\mathrm { p } / 3$\\
(D) $\mathrm { p } / 2$\\

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