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  4. Which one is a vector quantity?

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Q. Which one is a vector quantity?

AFMCAFMC 2003Motion in a Plane

Solution:

Scalar quantity is one which has magnitude only, example time, temperature, flux density. But vector quantity is one which has both magnitude and direction.
In physics magnetic field is an entity produced by moving electric charges (electric currents) exerting a force on the other moving charges. A magnetic field is a vector quantity it associates with every point in space, a (pseudo) vector that may vary in time. The direction of the field is the equilibrium direction of a compass needle placed in the field.