Grade 12th passVectors
if r satisfies the equation r x (i +2 j+ k)= i-k then for any scalar m , r is eqaul to?????
if r satisfies the equation r x (i +2 j+ k)= i-k then for any scalar m , r is eqaul to?????
6 Answers
ng29
consider r =ai+bj+ck
and solve lhs by using crosss product now get single equations in i,j and k
compare coefficients of i, j and k and u get the desired vector
approve if useful
ng29
wait …..wait........
what is m ?????
mansi dabriwal
i tried through that only ….but don know what this m...stands for...
options for this ques. …
a) i+m(i+2j+k)
b) j+ m(i+2j+k)
c) k+m(i+2j+k)
d) i- k +m (i+2j+k)
ng29
Approved Tutor Answer11 Years agoanswer is b)
now i understand that what is m
when u compare the both sides u does not get exact coeffiicients of r
i am solving completely for u
let r=ai+bj+ck
on taking cross product and comparing we get a=c , b=2c+1
put these values in r
we get r = ci+(2c+1)j+ck
r = j + c(i+2j+k)
in options they had considered m in place of c
APPROVE IF USEFUL
mansi dabriwal
k...i got it...thanx...
ng29
my pleasure
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