हिंदी

If a→,b→,c→ are vectors such that [a→,b→,c→] = 4, then [a→×b→,b→×c→,c→×a→] = -

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प्रश्न

If `veca, vecb, vecc` are vectors such that `[veca, vecb, vecc]` = 4, then `[veca xx vecb, vecb xx vecc, vecc xx veca]` =

विकल्प

  • 16

  • 64

  • 4

  • 8

MCQ

उत्तर

16

Explanation:

We have, `[veca xx vecb, vecb xx vecc, vecc xx veca]`

= `(veca xx vecb) * {(vecb xx vecc) xx (vecc xx veca)}`

= `(veca xx vecb) * {(vecm . veca) vecc - (vecm * vecc) veca)} `  .....(where `vecm = vecb xx vecc`)

= `{(veca xx vecb) * vecc} * {(veca * (vecb xx vecc)}`

= `[veca, vecb, vecc]^2`

= 42

= 16.

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