The least possible quantity is zero.
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No. "Dimensionless" means there are NO units involved.
The magnitude of the least possible current that could exist is zero, in the absence of any flow of charge.
No, an object cannot have a constant speed and velocity at the same time. Speed is a scalar quantity that describes how fast an object is moving, while velocity is a vector quantity that includes both speed and direction. If the velocity is constant, then the speed can be constant as well, but the object must maintain a consistent direction.
The product of scalar and vector quantity is scalar.
In mathematics, an unknown quantity represented by a letter is usually called a variable. Variables are used to symbolize values that can vary in an equation or formula. They allow us to write general expressions that can represent multiple possible scenarios.