Vectors have magnitude and direction. The magnitude is always a positive number.
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No, the value can't be negative because magnitude of a vector is just how long it is regardless of its direction. :-)
The magnitude of a vector is always treated as non negative and the minus sign indicates the reversal of that vector through an angle of 180 degree.
A null vector has no magnitude, a negative vector does have a magnitude but it is in the direction opposite to that of the reference vector.
No because magnitude is like length and you cannot have negative length
It is the numerical value of the vector.