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Let bara=2overset(^)i+overset(^)j+overse...

Let `bara=2overset(^)i+overset(^)j+overset(^)k,barb=overset(^)i+2overset(^)j-overset(^)k` and a unit vectors `barc` be coplanar. If `barc` is prependicular to`bara`, then `barc=`

A

`(1)/(sqrt2)(-overset(^)j+overset(^)k)`

B

`(1)/(sqrt3)(-overset(^)i-overset(^)j-overset(^)k)`

C

`(1)/(sqrt5)(overset(^)i-2overset(^)j)`

D

`(1)/(sqrt3)(overset(^)i-overset(^)j-overset(^)k)`

Text Solution

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The correct Answer is:
A
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