Question

Q8
P +Q is
is a unit vector along x-axis.
If P = i - j+k,then what isQ
​

Answer 1

Answer:

Q= - ( k+j )

Explanation:

1) we have,

P + Q is a unit vector along x-axis ,

That is,

P+Q= i

2) Also, it is given that,

P= i+j+k

Since,

P+Q= i

=> Q=i - p

=> Q=i - ( i+j+k ) = (i - i) = ( j+k )

   =0 - ( j+k ) = - ( j+k )

Hence, Value of Q is -(j+k).

Magnitude of Q :

$[Q] = \sqrt{0^{2}+(-1)^2+(-1)^2\\}$

     =$\sqrt{1+1}$

     $=\sqrt{2}$

HOPE IT HELPS !!!

Answer 2

Q= - ( k+j )

Explanation:

1) we have,

P + Q is a unit vector along x-axis ,

That is,

P+Q= i

2) Also, it is given that,

P= i+j+k

Since,

P+Q= i

=> Q=i - p

=> Q=i - ( i+j+k ) = (i - i) = ( j+k )

=0 - ( j+k ) = - ( j+k )

Hence, Value of Q is -(j+k).