Magnitude, Direction and ....

Classical Mechanics Level 2

I give you two statements -

A. A vector is a quantity that has both magnitude and direction.

B. A quantity that has both magnitude and direction is a vector.

Which one of them is always true?

Both A and B B A

Abha Vishwakarma by Abha Vishwakarma , 20, India

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2 solutions

Pradeep Tripathi
Oct 28, 2018

Current and Pressure are two quantities that have magnitude as well as direction but are not vectors.

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Abha Vishwakarma
Sep 24, 2018

Take for example current. It has both magnitude and direction yet it isn't a vector. Because vectors have another property that they must follow and that is the parallelogram law of vector addition which current doesn't follow.

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