1.

The vector `vecB= 5hati+2hatj-Shatk` is perpendicular to the vector `vecA= 3hati+hatj+2hatk` if S =A. 1B. 4.7C. 6.3D. 8.5

Answer» Correct Answer - 4
If `vecA bot vecB` then `vecA*vecB = 0 `
`" "(3hati+hatj+2hatk)*(5hati+2hatj-Shatk)=0`
`rArr 15+2-2S=0`
`rArr 2S = 17" "rArr " "S = 8.5`


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