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# How we can define Scalar & vector Quantity?What is the difference between Vector quantity & Scalar quantity?How we decide that this physical quantity is Vector or Scalar?Plz.... Give the answer.Thanks

Neer Varshney
76 Points
9 years ago

Scalar qua. are those which have only magnitude while Vector quantities have direxn also. So you can decide if a quantity is vector or scalar by cheking if it has direction or not,

Ex.

Vector: Force,Velocity,Displacement

Scalar: Distance, Work,Speed,Time

nikhil roy
31 Points
9 years ago
The answer to your question goes like this. Scalar quantity are those quantities which do not require direction to express themself.They are defined alone by a magnitude.A SIMPLE EXAMPLE SuPPOSE someone asks you your weight. You answer 50kg...thus this is only magnitude and so it is a scalar...And for defiinig your weight you need not tell the direction like 50kg in north direction..These are meaningless. A vector quantity has got magnitude+direction and it also follows vector laws of Algebra. example.If someone asks you a location..you wont just say the name of the place as it will be of no help..you will specify some directions..And specifying directions is a property of vector quanties.Remember vector =scalar +direction. Eg. Velocity=speed+direction. Note; time and electric current are scalars.