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Question

Difference between scalar product ( dot product) and vector product.

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Solution

Dot product or scalar product Cross product or vector product
If the product of two vectors is a scalar quantity, the product is called scalar product or dot product. If the product of two vectors is a vector quantity then the product is called vector product or cross product.
The dot product is defined by the relation:
A . B = AB Cos θ
The cross product is defined by the relation:
A × B = AB Sinθ u
The scalar product obeys commutative law as
A.B =B.A
The vector or cross product does not obey commutative law
A×B ≠B×A
If two vectors are perpendicular to each other then their scalar product is zero.
A.B =0
If two vectors are parallel to each other, their vector product is zero.
A×B=0



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