Question

Let and be four non-zero vectors such that = 0, = $| \overrightarrow { \mathrm { b } } |$ , $| \overrightarrow { \mathrm { r } } \times \overrightarrow { \mathrm { c } } |$ =, then [a, b, c] =

• A. | a | | b | | c |
• B. – | a | | b | | c |
• C. 0
• D. None of these

Answer 1

Answer: (C)

0

Answer 2

$\overrightarrow { \mathrm { r } } \cdot \overrightarrow { \mathrm { a } }$ = 0, =and = $| \overrightarrow { \mathrm { r } } \| \overrightarrow { \mathrm { c } } |$

Ž $\overrightarrow { \mathbf { r } }$ ⊥ \ are coplanar \ $[ \overrightarrow { \mathrm { a } } , \overrightarrow { \mathrm { b } } , \overrightarrow { \mathrm { c } } ]$ = 0