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If vecxxxvecy=veca, vecy xx vecz=vecb, v...

If `vecxxxvecy=veca, vecy xx vecz=vecb, vecx.vecb=gamma, vecx.vecy=1 and vecy.vecz=1 ` then find x,y,z in terms of `veca,vecb and gamma.

A

`gamma/(|veca xxvecb|^(2))[veca+vecbxx(vecaxxvecb)]`

B

`gamma/(|veca xxvecb|^(2))[veca+vecb-vecaxx(vecaxxvecb)]`

C

`gamma/(|veca xxvecb|^(2))[veca+vecb+vecaxx(vecaxxvecb)]`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
c

Given
`vecx xx vecy=veca` (i)
`vecy xx vecz=vecb` (ii)
`vecx.vecb =gamma` (iii)
`vecx.vecy=1` (iv)
`vecy .vecz=1` (v)
from (ii) , `vecx.(vecy xx vecz) =vecx .vecb=gamma Rightarrow [vecx vecy vecz] = gamma`
From (i) and (ii) , `(vecx xx vecy) xx (vecy xx vecz) =veca xx vecb`
` [vecx vecy vecz]-[vecy vecy vecz] = veca xx vecb`
` or vecy = (veca xx vecb)/ gamma`
Also from (i), we get ` (vecx xx vecy) xx vecy =veca xx vecy `
` or (vecx.vecy) vecy- (vecy.vecy)vecx =veca xx vecy`
`or vecx = (1//|vecy|^(2))(vecy - veca xx vecy)`
`gamma^(2)/(|vecaxx vecb|^(2))[(vecaxxvecb)/gamma-(vecaxx(vecaxxvecb))/gamma]`
`gamma/(|veca xx vecb|^(2))[veca xx vecb-vecaxx (veca xx vecb)]`
Also from (ii) , `(vecy xx vecz)xxvecy = vecb xx vecy`
`or |vecy|^(2)vecz-(vecz.vecy)vecy= vecbxxvecy`
`or vecz= 1/(|vecy|^(2))[vecy+vecb xx vecy]`
`gamma/(|vecaxxvecb|^(2))[vecaxxvecb +vecb xx (veca xx vecb)]`
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