1.

If A + B is a unit vector along x-axis and A = i-j+k, then what is B ?(a) j+k(b) j-k

Answer»

we have to find that vector, which on adding to A = i-j+k , gives one as magnitude

so the best answer is option b => i-j+k +(j-k) = i-j+k+j+k = i, and |i| = 1



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