What are vectors and scalars ?

What are vectors and scalers?

If bara,barb are non-collinear vectors and x,y are scalars such that xbara+ybarb=bar0 , then...a)x = 0 , but y is not necessarily zero b)y = 0 , but x is nont necessary zero c)x = 0 , y = 0 d)None of these

Answer the following questions orally: Is magnetic force a vector or a scalar quantity?