1.

If `vec(A)=hati +hat j` and `vec(B)=hati-hatj` The value of `(vec(A)+vec(B)).(vec(A)-vec(B))` is :A. `sqrt(2)`B. 0C. `(1)/(2)`D. 2

Answer» Correct Answer - B
`vec(A)+vec(B)=2 hat(i)`
`vec(A)-vec(B)=2 hat(j)`
`(vec(A)+vec(B)).(vec(A)-vec(B))=4 hati. hatj=0`.


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