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CBSE Class 12-science Answered

If a =  i – 2j + 3k and b = i – 3k  then find I b X 2aI    i j and k and k are unit vector

Asked by haroonrashidgkp | 02 Nov, 2018, 09:28: PM
Expert Answer
begin mathsize 16px style straight a with bar on top equals straight i with hat on top minus 2 straight j with hat on top plus 3 straight k with hat on top space and space straight b with bar on top equals straight i with hat on top minus 3 straight k with hat on top
2 straight a with bar on top equals 2 straight i with hat on top minus 4 straight j with hat on top plus 6 straight k with hat on top
straight b with bar on top cross times 2 straight a with bar on top equals open vertical bar table row cell straight i with hat on top end cell cell straight j with hat on top end cell cell straight k with hat on top end cell row 1 0 cell negative 3 end cell row 2 cell negative 4 end cell 6 end table close vertical bar equals left parenthesis 0 minus 12 right parenthesis straight i with hat on top minus left parenthesis 6 plus 6 right parenthesis straight j with hat on top plus left parenthesis negative 4 minus 0 right parenthesis straight k with hat on top equals negative 12 straight i with hat on top minus 12 straight j with hat on top minus 4 straight k with hat on top
Now space find space out space its space magnitude.


end style
Answered by Sneha shidid | 04 Nov, 2018, 12:09: PM
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