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it's very simple ..
let there be 2 vectors
A = a1i+ a2j + a3k
B = b1i + b2j + b3k
(where a1, a2, a3, b1, b2, b3 are numerical constant & i, j, k are unit vectors along X Y and Z axsis rep.)
then A.B (A dot B) is
R (resultant)= (a1*b1)i + (a2*b2)j+(a3*b3)k
a1*b1 simply means multiplying the numbers
i hope it seems easy to u...
Dot product of two vectors, say a and b is ab cos(theta)
Now let there be two vectors
a = a1 i + a2 j + a3 k
and b = b1 i + b2 j + b3 k
so a.b = a1b1 + a2b2 + a3b3 (as i, j, and k are perpendicular to each other and cos 90 = 0)
The direction of the resultant is perpendicular to the plane containing the two vectors.
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