1.

Three vectors a=hati+hatj-hatk, b=-hati+2hatj+hatk and c=-hati+2hatj-hatk, then the unit vector perpendicular to both a+b and b+c is

Answer»

`(HATI)/(sqrt3)`
`6hatk`
`(HATK)/(sqrt3)`
`(hati+hatj+hatk)/(sqrt3)`

SOLUTION :`(a+b) xx (b+c)=3hatj xx (-2hati+4hatj)=6hatk`
So, REQUIRED UNIT vector is `6hatk`.


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