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Let vec u be a vector coplanar with the ...

Let `vec u` be a vector coplanar with the vectors `vec a = 2 hat i + 3 hat j - hat k` and `vec b= hat j+hatk` If `vec u` is perpendicular to `vec a` and `vec u.vecb=24` then `|vecu|^2` is equal to

A

336

B

315

C

256

D

84

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • The number of unit vectors perpendicular to the vector vec(a) = 2 hat(i) + hat(j) + 2 hat(k) and vec(b) = hat(j) + hat(k) is

    A
    one
    B
    two
    C
    three
    D
    infinite

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