MCQ
$|a \times i{|^2} + |a \times j{|^2} + |a \times k{|^2} = $
- A$|a{|^2}$
- ✓$2\,\,|a{|^2}$
- C$3\,\,|a{|^2}$
- D$4\,\,|a{|^2}$
$ = \,|{a_3}j - {a_2}k{|^2} = a_3^2 + a_2^2$
Similarly, $|a \times j{|^2} = a_1^2 + a_3^2$ and $|a \times k{|^2} = a_1^2 + a_2^2$
Hence the required result can be given as
$2(a_1^2 + a_2^2 + a_3^2) = 2|a{|^2}.$
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