This may not be the appropriate forum for this but seemed to be the closest.
I am trying to understand some concepts around MRI physics and it is common to use external magnetic fields created using gradient coils to manipulate the main magnetic field strength at different locations.
Now, the books talk in terms of gradient amplitude and the units they typically use is mT/m (microtesla/metre). I am not sure why there is this per meter as it is just the gradient amplitude should it not just be microtesla or teslas? Why is it defined per unit distance?