If A.B=0, then between them is:
Correct answer: D. 90
- A. 0
- B. 45
- C. 60
- D. 90
Explanation
Dot product of two vectors is obtained by multiplying their magnitudes and the cos of angle between them. It is orepresented by a dot(.) between the two vectors. A.B=ABcosNow if A and B are nonzero vectors, their dot product can only be zero if cos is zero. As cos 90=0, hence the angle between them is 90 degrees.BEWARE: cos 0=1
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About Scalar Product
The scalar product of two vectors is A dot B equals AB cos theta, producing a scalar determined by their magnitudes and included angle. Applications include work done and projection of one vector on another, with perpendicular vectors giving zero and the scalar product distinguished from the vector product.
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