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Let vec a=2 hat i+ hat j+ hat k , hat b...

Let ` vec a=2 hat i+ hat j+ hat k , hat b= hat i+2 hat j- hat k` and a unit vector ` vec c` be coplanar. If ` vec c` is perpendicular to ` vec a` then ` vec c=` `+-1/(sqrt(2))(- hat j+ hat k)` (b) `1/(sqrt(3))(- hat i- hat j- hat k)` `1/(sqrt(5))( hato-2 hat j)` (d) `1/(sqrt(3))( hat i- hat j- hat k)`

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