If \[\vec{\lambda }\] is a unit vector perpendicular to plane of vector a and b and angle between them is q, then a . b will be [RPET 1985]

\[|\mathbf{a}|\,\,|\mathbf{b}|\,\sin \theta \,\]

\[|\mathbf{a}|\,\,|\mathbf{b}|\,\sin \theta \,\vec{\lambda }\]

\[|\mathbf{a}|\,\,|\mathbf{b}|\,\cos \,\,\theta \,\vec{\lambda }\]

\[|\mathbf{a}|\,\,|\mathbf{b}|\,\cos \,\,\theta \,\]

If \[\vec{\lambda }\] is a unit vector perpendicular to plane of vecto

1.	If \[\vec{\lambda }\] is a unit vector perpendicular to plane of vector a and b and angle between them is q, then a . b will be [RPET 1985]
A.	\[\|\mathbf{a}\|\,\,\|\mathbf{b}\|\,\sin \theta \,\vec{\lambda }\]
B.	\[\|\mathbf{a}\|\,\,\|\mathbf{b}\|\,\cos \,\,\theta \,\vec{\lambda }\]
C.	\[\|\mathbf{a}\|\,\,\|\mathbf{b}\|\,\cos \,\,\theta \,\]
D.	\[\|\mathbf{a}\|\,\,\|\mathbf{b}\|\,\sin \theta \,\]
Answer» D. \[\|\mathbf{a}\|\,\,\|\mathbf{b}\|\,\sin \theta \,\]

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If \[\vec{\lambda }\] is a unit vector perpendicular to plane of vector a and b and angle between them is q, then a . b will be [RPET 1985]

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