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Class 10 Class 12
Define cross product of two vectors. Show that cross product of two vectors anti commute.

Cross product of two vectors is a vector whose magnitude is equal to product of the magnitude of each vector and sine of angle between them and is directed along the normal to the plane containing two vectors.

The direction of the cross product of two vectors, that is  is determined by the right hand screw rule or right hand thumb rule.

The right hand screw rule states that when you place a screw perpendicular to the plane containing vectors  Rotate the cap of a screw from  to find the direction of  and  to find the direction of .

The direction in which the screw will advance gives us the direction of .

Therefore, by Right Hand Screw Rule, the direction of

Now,

and

So, cross product of two vectors anti-commute.
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What is a scalar quantity?

A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.
1212 Views

What is a vector quantity?

A physical quantity that requires direction along with magnitude, for its complete specification is called a vector quantity.
835 Views

What are the basic characteristics that a quantity must possess so that it may be a vector quantity?

A quantity must possess the direction and must follow the vector axioms. Any quantity that follows the vector axioms are classified as vectors.

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Give three examples of scalar quantities.

Mass, temperature and energy
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Give three examples of vector quantities.

Force, impulse and momentum.
865 Views